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Following are the closing prices (in dollars) of a certain stock for the past 20 trading days. Find the population standard deviation for the closing prices.

$11.10

Qualitative Data

*Deals with descriptions. *Data can be observed but not measured. *Colors, textures, smells, tastes, appearance, beauty, etc. Qualitative → Quality Example: Oil Painting

Quantitative Data

*Deals with numbers. *Data which can be measured. *Length, height, area, volume, weight, speed, time, temperature, humidity, sound levels, cost, members, ages, etc. Quantitative → Quantity

Discrete data

*information that can be categorized into a classification *based on counts *Only a finite number of values is possible, and the values cannot be subdivided meaningfully. Example: the number of parts damaged in shipment

Continuous Data

*information that can be measured on a continuum or scale *can have almost any numeric value and can be meaningfully subdivided into finer and finer increments, depending upon the precision of the measurement system.

For a population of people who completed their GED, the average age of completion was 32.6 and the standard deviation was 4.9. The distributions of ages was approximately bell shaped. Compute the Z score for an individual who completed their GED at the age of 25

-1.55

Hey study show that in a certain month The mean time spent per visit to Facebook was 19.5 minutes assume the standard deviation of the population is eight minutes suppose that is simple random sample of 100 visits in that month as a sample mean of 21.51 minutes. A social scientist is interested in knowing whether the meantime of Facebook visit has increased. Perform the hypothesis test and compute the P value

0.0060

H0: mean=5 H1: mean<5 A test is performed with a sample of size 25. The sample mean was 4.60 and the population standard deviation is 1.2. Assume that the population is approximately normal. Compute the P value

0.0478

According to one pollster 40% of children are afraid of the dark. Suppose that a sample of size 22 is done. Find the value of the standard deviation of the distribution of sample proportion's

0.10

Jaden has a coin that is weighted so that the probability that tails appears when it is tossed is 0.57 suppose that the coin is tossed four times what is the probability that all four tosses is are tails

0.1056

A data set has a mean of 177 and a standard deviation of 20. Compute the coefficient of variation.

0.11

The probability that a randomly selected commuter Listens to audiobooks during their commute is 0.46. Suppose that a sample of 12 commuters is selected what is the probability that at most three of them listen to audiobooks

0.12

H0: mean=7 H1: mean does not=7 A test is performed with a sample of size 36. The sample mean was 2.41 and the population standard deviation is 18. Calculate the P value

0.1260

The weight of bowling balls are normally distributed with mean 11.5 pounds and standard deviation 2.7 pounds. A sample of 36 bowling balls is selected. What is the probability that the average weight of the sample is less than 11.01 pounds

0.1381

One hundred students are shown an eight-digit number on a piece of cardboard for three seconds and are asked to then recite the number from memory. The process is repeated until the student accurately recites the entire number from memory. The following histogram presents the number of trials it took each student to memorize the number.

0.14

The probability that a student uses smart thinking online tutoring on a regular basis is 0.37. In a group of 18 students what is the probability that exactly 5 of them use smart thinking online tutoring on a regular basis

0.1463

A survey of high school students revealed that the number of soft drinks consumed per month was normally distributed with me 25 and standard deviation 15. A sample of 36 students were selected. What is the probability that the average number of soft drinks consume per month for the sample was between 27.2 and 30 soft drinks

0.1667

At a local college, the probability that there are no parking places available for an 11:00 am class is 0.72 . What is the probability that there is at least one parking place available for the 11:00 am class?Write only a number a your answer. Round to two decimal places (for example: 0.73). Do not write as a percentage.

0.28

At a local university when scheduling classes the probability that there are no evening classes available on a certain day is 0.70 what is the probability that there is at least one evening class available that day

0.30

Are you certain college, 50% of all students take advantage of free tutoring services. A sample of 36 students is selected. What is the probability that the proportion of students who take advantage of free tutoring services in the sample Is between 0.495 and 0.580

0.3554

According to Chebyshev's theorem, the maximum proportion of data values from a data set that are more than 1.5 standard deviations from the mean is .

0.44

On a cold winter day in February, many students in Ms. Bush's sixth-grade class had runny noses and sore throats. After examining each student, the school nurse constructed the following table. Sore Throat No Sore Throat Runny Nose 2 4 No Runny Nose 6 12 Find the probability that a randomly selected student has a runny nose or a sore throat. Write only a number a your answer. Round to two decimal places (for example: 0.73). Do not write as a percentage.

0.50

It has been reported that 48% of people text and Drive. A random sample of 60 drivers is drawn. Find the probability that the proportion of people in the sample who text and drive is less than 0.487

0.5432

If P(A) = 0.45 , find P(Ac).Write only a number as your answer. Round to two decimal places (for example: 0.27). Do not write as a percentage.

0.55

If P(A) = 0.28 , P(B) = 0.63 , and P(A and B) = 0.34 , find P(A or B). Write only a number as your answer. Round to two decimal places (for example: 0.27). Do not write as a percentage.

0.57

In a survey on study habits, students at a local college were asked whether they listened to music while studying. The following table was constructed. Listens to Music Does Not Listen to Music Male 48 35 Female 7 29 Find the probability that a randomly selected student is female or does not listen to music while studying. Write only a number a your answer. Round to two decimal places (for example: 0.73). Do not write as a percentage.

0.60

The numbers of minutes that Travellers arrive at the airport before their scheduled departure are approximately normally distributed with mean 80.5 and standard deviation 9.9 what proportion of travelers arrive at the airport more than 74.8 minutes before their departure

0.7190

Types of bonds are divided into three categories good risk medium risk and poor risk. Assume that of a total of 11,474 bonds, 7326 are good risk 1045 or medium risk and the rest or poor risk. One bond is chosen at random what is the probability that the bond is not a poor risk

0.73

Find the area under the standard normal curve that lies between Z= -0.84 and Z = 1.98

0.7757

The probability of winning something on a single play at a slot machine is 0.24 after six plays on the slot machine what is the probability of winning at least once

0.8073

The average price of a plane ticket to New York is $481 with a standard deviation of $41. Assume these prices are normally distributed. What proportion of plane ticket prices are less than $518

0.8159

If P(A) = 0.35 and P(B) = 0.48 . If A and B are mutually exclusive, find P(A or B). Write only a number as your answer. Round to two decimal places (for example: 0.27). Do not write as a percentage.

0.83

At a car rental agency 0.43 Of the cars are returned on time a sample of 13 car rentals is studied what is the probability that more than three of them are returned on time

0.88

Let V be the event that a computer contains a virus, and let W be the event that a computer contains a worm. Suppose P(V) = 0.14 ,P(W) = 0.02 , and P(V and W) = 0.05 . What is the probability that the computer contains neither a virus nor a worm? Write only a number a your answer. Round to two decimal places (for example: 0.73). Do not write as a percentage.

0.89

Given that the variance for a data set is 1.20 , what is the standard deviation?

1.10

Find the mode for the following data set:10 30 10 36 26 22

Find the range of the set of values 4, 13, 3, 10, and 5.

To use the central limit theorem of proportion's, the quantities no and n(1-p) must be greater than or equal to_______

Natural gas bills in a certain city have a mean 113. $15. Assume the bills are normally distributed with the new deviation 18. $69. Find the value that separates the lower 33% of the bills from the rest

104.93

Find the mode for the following data set:33 28 22 11 11 17

What is the midrange of the following data set?5, 11, 10, 12, 4, 12, 18, 18, 18

What is the median of the following set of values?2, 16, 14, 10, 14, 9, 10, 14

For the data set below, list the outliers, if any. 45 50 47 70 47 12 41 43 64 53 31 63 37 45 66 63 53 60 93 59

12 and 93

Suppose that a sample of size 42 is John from the population with mean 82 and standard deviation 80. Find the value of the standard deviation of the Distribution of sample mean

12.34

Electricity bills in a certain city have a mean $123.31. Assume the bills are normally distributed with standard deviation $10.72. A sample of 73 bills was selected for an audit. Find the 48 percentile for the sample mean

123.25

A data set has a median of 84, and six of the numbers in the data set are less than median. The data set contains a total of n numbers.If n is odd, and exactly one number in the data set is equal to 84, what is the value of n?

What is the range of the set of values 5, 8, 3, 9, and 17.

Individuals who have a particular gene have a 0.73 probability of contracting a certain disease. Suppose that 1253 individuals with the gene participate in a lifetime study what is the standard deviation of the number of people who eventually contract the disease

15.72

In a certain class 23% of the students are left-handed suppose that a random sample of 71 students is selected find the mean number of left-handed students in the class

The grades for the trigonometry exam are listed below. Find the range. 85, 76, 93, 82, 84, 90, 75

The average weight of adult male bison in a particular federal wildlife preserve is 1450 pounds with a standard deviation of 240 pounds. Find the weight of an adult bull whose is z-score 1.5.

1810 lb

For the data set below, find the upper outlier boundary. 154, 160, 146, 146, 131, 148, 164, 199, 169, 139, 165

193.5

Use the given frequency distribution to approximate the mean. Class: 0-9, 10-19, 20-29, 30-39, 40-49. Freq: 18,18, 9,9,9

20.7

Find the median for the following data set:27 21 15 25 15

A random sample of 40 videos posted to YouTube is selected. A month later the number of times that each had been viewed was tabulated. The main number of viewing was 81 with a sample standard deviation of 310 find the upper bound of the 99% confidence interval for the main number of times videos posted to YouTube have been viewed in the first month

214

Find the mean for the following data set:28 25 23 34 14 14

Find the mean for the following data set:32 15 29 15 25

23.2

The number of police officers in selected city districts is listed below. Find the mode. 24,26,24,30,23,28,19,31,24,26, 19

Compute Median: 17, 36, 305, 111, 21, 6, 41, 25, 5, 37, 51

Compute the IQR: 6, 7, 19, 20, 22, 25, 27, 45, 48, 59

Find the median of the data in the following stem-and-leaf plot. The leaf represents the ones digit.

Compute the mean: 242, 228, 230, 228, 238, 357, 258, 310, 277, 261

262.9

The following table presents the heights (in inches) of a sample of college basketball players. Height: 68-71, 72-75, 76-79, 80-83, 84-87 Freq: 3,5,2,2,2

28.8

Compute the mean: 261, 321, 310, 321, 285, 357, 258, 230, 277, 242

286.2

Give the boundaries of the given value 3.089

3.0885-3.0895

Calculate the sample standard deviation: 23, 23, 18, 18, 25, 21, 28, 28

3.93

Suppose that a sample of size 71 is drawn from a population with mean 34 and standard deviation 62. Find the value of the mean of the distribution of sample means

A simple random sample of 12 e-readers of a certain type had the following minutes of battery life: 287, 311, 262, 392, 313, 268, 277, 316, 286, 322, 350, 291 Assume that it is reasonable to believe that the population is approximately normal and the population standard deviation is 60. What is the upper bound of the 95% confidence interval for the battery life for all the e-readers of this type

340.2

In a sample of Starbucks customers it was found that the number of individual items brought per month at Starbucks was 13 with a standard deviation of 11. Assume the data to be approximately bell shaped. Approximately 95% of the time the number of monthly items purchased was between two values A and B what is the value of B?

A recent survey of a new diet cola reported the following percentages of people who liked the taste. Find the weighted mean of the percentages. Area: 1,2,3 %favored: 30, 25,50 Number surveyed: 2500, 1500,3000

Find the sample variance for the following data set: 25 20 19 15 31

Find the sample variance for the following data set:25 20 19 15 31

A survey among freshman at a certain university revealed that the number of hours spent studying the week before finals exams was normally distributed with mean 38 and standard deviation 7. Find percentile corresponding to P =52% of the number of hours studying

38.35

Compute the median: 58, 29, 26, 66, 52, 62, 13, 23

40.5

A college admissions officer takes a simple random sample of 96 entering freshman and computes mean mathematics SAT score to be 473. Assume the population standard deviation is 116. What is the lower bound of the 99% confidence interval

443

Find the mode for the following data?5, 4, 3, 4, 5, 6, 5, 5, 3, 4

Calculate the sample variance: 25, 22, 25, 20, 21

5.3

A random sample of weights of sapphires in a jeweler's collection is shown. Find the mean of the sample.

5.69

The following population parameters were obtained from a graphing calculator. Assuming the population is bell-shaped, between what two values will approximately 68% of the population be?

52 to 74

Efficiency expert's study the process used to manufacture items in order to make them as efficient as possible one of the steps used to manufacture a metal clamp involves the drilling of three holes and a sample of 72 clamps the mean time to complete this step was 56.4 seconds. I assume that the population standard deviation is nine seconds. What is the lower bound of the 98% confidence interval

53.9

Following is a pie chart that presents the percentages spent by a certain household on its five largest annual expenditures. This household has budegted $55,000 this year for these five expenses. How much money is budgeted this year for housing and insurance? Food 27.7% Insurance 26.7% Housing 24.8% Utilities 12.9% Recreation 7.9%

55,000*.248=13,640 55,000*.267=14,685 13,640+14,685=28,325 Answer: 28,325

A company has developed a new type of lightbulb, and wants the estimate it's mean lifetime. A simple random sample of 12 bulbs how do you sample mean lifetime of 646 hours with a sample standard deviation of 48 hours. It is reasonable to believe that the population is approximately normal. Find a lower bound of a 95% confidence interval for the population mean lifetime of all bulbs manufactured by this new process

616

For the data set below, find the first quartile. 78 65 63 67 67 64 72 78 75 65 74

A paint manufacturer discovers that the mean volume of paint in a gallon-sized pail is 1 gallon with a standard deviation of 0.05 gallons. The paint volumes are approximately bell-shaped. Estimate the percent of pails with volumes between 0.95 gallons and 1.05 gallons.

68%

A random sample of 13 students were asked how long it took them to complete a certain exam. The mean length of time was 105.8 minutes with a standard deviation of 74.5 minutes. Find the lower bound of the 90% confidence interval for the true mean length of time it would take for all students to complete the exam

69.0

The GMAC Insurance company reported that the mean score on the national drivers test was 73.1 with a standard deviation of 4.0. The test scores are approximately bell shaped approximately 68% of all test scores were between two values A and B what is the value of A?

69.1

Identify the five number summary of the following data set. 7,11,21,28,32,33,37,43

7, 16, 30, 35, 43

In an English course, students had to turn in a final paper. The mean grade earned by the class was 73.6 with a standard deviation of 3.6 points. The scores are approximately bell shaped. Approximately 68% of all final paper scores were between two values a and B. What is the value of a?

70.0

A random sample of 13 students were asked how long it took them to complete a certain exam. The mean length of the time was 119.6 minutes with a standard deviation of 82.1 minutes. Find the lower bound of the 90% confidence interval for the true mean length of time it would take for all students to complete the exam

79.0

A soft-drink bottling company fills and ships soda in plastic bottles with a target volume of 354 milliliters. The filling machinery does not deliver a perfectly consistent volume of liquid to each bottle, and the three quartiles for the fill volume are Q1= 354, Q2= 358 and Q3-362

Following are heights, in inches, for a sample of college basketball players. 8377838484817983837777827880838381848181 Find the mean height of the basketball players.

81.2 inches

Approximate the sample variance given the following frequency distribution. Class: 0-19,20-39,40-59,60,79,80-99. Freq: 14,15,9,9,9

810.4

A student has an average of 78 on seven chapter tests. If the student's scores on six of the tests are 72, 82, 84, 66, 68, and 89, what was the score on the remaining test?

Approximate the population variance given the following frequency distribution. Class: 0-19,20-39,40-59, 60-79,80-89 Freq: 15,13,8,10,10

857.0

Which of the following is the properly rounded mean for the given data?7, 8, 13, 9, 10, 11

9.7

A committee consists of 12 women and 10 men. Three members are chosen as officers. What is the probability that all three officers are women? A) 0.1623 B) 0.0779 C) 0.1429 D) 0.02705

A fair die is rolled two times. What is the probability that both rolls are 5? A) 0.028 B) 0.167 C) 0.0046 D) 0.083

A fast-food restaurant chain has 609 outlets in the United States. The following table categorizes them by city population and location and presents the number of outlets in each category. An outlet is chosen at random from the 609 to test market a new menu. Region Population of city NE SE SW NW Under 50,000 32 27 27 20 50,000 - 500,000 50 50 51 35 Over 500,000 72 123 78 44 Given that the outlet is located in the West (either SW or NW), what is the probability that it is in a city with population 50,000-500,000? A) 0.337 B) 0.242 C) 0.729 D) 0.141

A lot of 20 components contains 4 that are defective. Two components are drawn at random and tested. Let A be the event that that the first component drawn is defective, and B be the event that the second component drawn is defective. a. Find P(A). b. Find P(B|A). c. Find P(A and B). d. Are A and B independent? A) a. 0.2000 b. 0.2105 c. 0.0421 d. No B) a. 0.2000 b. 0.1579 c. 0.0316 d. No C) a. 0.2105 b. 0.1111 c. 0.0421 d. Yes D) a. 0.2000 b. 0.1579 c. 0.0316 d. Yes

A report states that the mean household income last year for a certain rural county was $48,200 and the median was $56,600. If a histogram were constructed for the incomes of all households in the county, would you expect it to be skewed to the right, to the left, or approximately symmetric? A) skewed to the left B) skewed to the right C) approximately symmetric

A study found that the mean amount of time that people in the United States spent watching TV was 168.1 hours per year. The same study found that the median was 166.4 hours per year. If a histogram were constructed for the data, would you expect it to be skewed to the right, to the left, or approximately symmetric? A) approximately symmetric B) skewed to the right C) skewed to the left

Compute the correlation coefficient. x 3 4 5 6 7 8 y 91 93 102 123 130 122 A) 0.092 B) 0.825 C) 65.067 D) 0.908

Determine which of the following describes ordinal data. i. My best friends are Georgia, Amithaba, and Raphael. ii. My favorite numbers are 2, 7 and 13. A) neither i nor ii B) i only C) both i and ii D) ii only

If P(A) = 0.76, P(B) = 0.44, and P(A and B) = 0.28, find P(A or B). A) 0.28 B) 0.14 C) 0.6 D) 0.92

If P(AC) = 0.77, find P(A). A) 0.77 B) 0.115 C) 0.385 D) 0.23

In a recent poll, 64% of the respondents supported stricter gun laws. Is this an example of statistic or a parameter? A) Statistic B) Parameter

Let A and B be events with P(A) = 0.6, P(B) = 0.2. Assume that A and B are independent. Find P(A and B). A) 0.12 B) 0.6 C) 0.33 D) 0.2

There are 25 students in a sixth-grade class. On a cold winter day in February, many of the students had runny noses and sore throats. After examining each student, the school nurse constructed the following table: Sore throat No sore throat Runny nose 4 6 No runny nose 2 13 Find the probability that a randomly-selected student has a runny nose or a sore throat. A) 0.64 B) 0.16 C) 0.32 D) 0.48

Use the given frequency distribution to approximate the mean. Class Frequency 0 - 19 15 20 - 39 9 40 - 59 17 60 - 79 8 80 - 99 18 A) 51.5 B) 29.8 C) 30 D) 13.4

Determine which of the following describes qualitative data A. The make of the car with license plate number VNS-862 B. The license plate number VNS-862 C. The number of vehicles whose license plate number begins with "VNS"

A and B

Determine which of the following describes nominal data A. My favorite days of the week or Friday Saturday and Tuesday B. My favorite day of the week is Friday my second favorite is Saturday and third favorite is Tuesday

A only

Which one of the following data are discrete A. The preseason ranking of duke university's men's basketball team B. The average height of players on the University of Connecticut women's basketball team C. The average preseason ranking of the University of Connecticut women's basketball team over the past 10 years D. The height of the tallest player on the duke university's men's basketball team

A only

Experimental Unit

A person, object, or some other well-defined item upon which a treatment is applied

Which of the following correctly describes the relationship between a sample in a population

A sample is a group of subjects selected from a population to be studied

stratified random sample

A sample that classifies the population into groups of similar individuals then chooses a separate simple random sample in each of the groups and combines them to form the full sample

Determine which of the following describes quantitative data A. The length of an object in feet B. The speed of an object in meters per second C. The number of objects that are blue

A,B, and C are correct

A study conducted by researchers was designed "to determine if application of duct tape is as effective as cryotherapy in the treatment of common warts."The researchers randomly divided 50 patients into two groups. The 25 patients in group 1 had their warts treated by applying duct tape. The 25 patients in group 2 had their warts treated by cryotherapy. Once the treatments were complete, it was determined that 74% of the patients in group 1 and 64% of the patients in group 2 had complete resolution of their warts. The researchers concluded that duct tape is significantly more effective in treating warts than cryotherapy. List the descriptive statistics. Which of the following is correct? A. 74% of patients in group 1 and 64% of patients in group 2 with complete resolution B. 25 patients in group 1 C. 25 patients in group 2

A. 74% of patients in group 1 and 64% of patients in group 2 with complete resolution

A study conducted by researchers was designed "to determine if application of duct tape is as effective as cryotherapy in the treatment of common warts."The researchers randomly divided 50 patients into two groups. The 25 patients in group 1 had their warts treated by applying duct tape. The 25 patients in group 2 had their warts treated by cryotherapy. Once the treatments were complete, it was determined that 74% of the patients in group 1 and 64% of the patients in group 2 had complete resolution of their warts. The researchers concluded that duct tape is significantly more effective in treating warts than cryotherapy. State the conclusion of the study. Which of the following is correct? A. Duct tape is significantly more effective than cryotherapy in treating warts. B. Cryotherapy is significantly more effective than duct tape in treating warts. C. Duct tape and cryotherapy are equally effective in treating warts.

A. Duct tape is significantly more effective than cryotherapy in treating warts.

A published study looked at levels of a protein released when the heart is stressed. Researchers measured the protein levels in 1030 patients and followed their health for five years. People with the highest protein level were 1 1/4 times more likely to die from any cause than those with the lowest, The lead researcher said, "It sort of tells you that no matter what condition you have, higher levels of these proteins are associated with worse outcomes." Use this information to answer the questions that follow. Identify the research question the study address. Which of the following is the research question? A. How is the level of a certain protein associated with a person's health? B. In what ways does the level of this protein affect the cause of death? C. How does a person's health change over a five-year period?

A. How is the level of a certain protein associated with a person's health?

A quality-control manager randomly selects 50 bottles of tomato sauce that were filled on October 11 to assess the calibration of the filling machine. What is the sample study? A. The 50 bottles of tomato sauce produced in the plant on October 11 B. Bottles of tomato sauce produced in the plant C. The 50 bottles of tomato sauce produced in the plant in October D. Bottles of tomato sauce produced in the plant on October 11

A. The 50 bottles of tomato sauce produced in the plant on October 11

A news service conducted a survey of 1000 adults ages 18 years or older in a certain country, August 31 - September 2, 2009. The respondents were asked, "Of every tax dollar that goes to the federal government, how many cents of each dollar would you say are wasted?" Of the 1000 individuals surveyed, 38% indicated that 51 cents or more is wasted. The news service reported that 38% of all adults in the country 18 years or older believe the federal government wastes at least 51 cents of each dollar spent, with a margin or error of 6% and a 95% level of confidence. What can be inferred from this survey? A. The news service is 95% certain that the percentage of all adults in the country who believe the federal government wastes 51 cents or more of every dollar received is between 32% and 44% B. There is a 38% chance the federal government wastes 51 cents of every dollar received. C. The news service is 95% certain that he percentage of all adults in the country who believe the federal government wastes 51 cents or more of every dollar received is 38%. D. There is a least a 89% chance the federal government wastes 51 cents or more of every dollar received.

A. The news service is 95% certain that the percentage of all adults in the country who believe the federal government wastes 51 cents or more of every dollar received is between 32% and 44%

It is extremely important for a researcher to clearly define the variables in a study because this helps to determine the type of analysis that can be performed on the data. For example, if a researcher wanted to describe hockey players based on jersey number, what level of measurement would the variable "Jersey number" be? Now suppose the researcher felt that certain player who were older received higher numbers. Does the level of measurement of the variable change? If so, how? Does the level of measurement of the variable change in the second scenario? Select the correct choice below and, if necessary, fill in the answer box within your choice. A. Yes, it changes to ______________ B. No, it stays the same.

A. Yes, it changes to ordinal

An experiment that tends to overestimate or underestimate the true value is said to be ______________. A. biased B. un-randomized C. randomized D. flagrant

A. biased

By visiting homes door-to-door, a municipality surveys all the households in 89 randomly-selected neighborhoods to see how residents feel about a proposed property tax increase. Identify the type of sample that is being used. A. cluster sample B. systematic sample C. voluntary response sample D. stratified sample

A. cluster sample

A(n) _______________ makes it difficult to determine whether an experimental outcome is due to the applied treatment. A. counfounder B. error C. perplexer D. uncooperative subject

A. counfounder

Determine which of the following describes ordinal data. i. My best friends are Georgia, Amithaba, and Raphael. ii. My favorite numbers are 2, 7 and 13. A. neither i nor ii B. ii only C. i only D. both i and ii

A. neither i nor ii

A middle school student passes out leaflets to the adults at a school function. The leaflets ask the recipient to indicate whether they believe in anthropogenic global warming. The bottom of the leaflet indicates that the completed leaflet should be returned to the student. Identify the kind of sample that is being used. A. sample of convenience B. systematic sample C. cluster sample D. stratified sample

A. sample of convenience

The names of all 130 students in a professor's class are written on identical slips of paper, and the slips are placed into a large glass jar. Then, the professor selects 5 random slips from the jar. Identify the kind of sample that is being used. A. simple random sample B. cluster sample C. systematic sample D. sample of convenience

A. simple random sample

A ___________ is a number that describes a sample. A. statistic B. measurement C. population D. parameter

A. statistic

The Gallup Organization contacts 1952 undergraduates who attend a university and live in the United States and asks whether or not they had spent more than $200 on food in the last month. What is the sample in the study? A.The 1952 undergraduates who attend a university and live in the United States B. Undergraduates who attend a university and live in the United States. C. The 1952 undergraduates who attend a university and have spent more than $200 on food D. Undergraduates who attend a university

A.The 1952 undergraduates who attend a university and live in the United States

What is the best description of a double-blind experiment

An experiment in which neither the investigators nor the subjects know how the treatments have been assigned

How do you best describe a randomized experiment

An experiment in which the treatments are assigned randomly to experimental units

Placebo

An innocuous medication, such as a sugar tablet, that looks, tastes, and smells like the experimental medication

Treatment

Any combination of the values of the factors (explanatory variables)

The completion times for a certain marathon race was 3 hours with a standard deviation of 0.5 hours. What can you determine about these data by using Chebyshev's Inequality with K=2

At least 75% of the completion times are between 2 hours and 4 hours.

(new) A botany student measured the lengths of a sample of leaves to the nearest centimeter. The data is shown in the frequency distribution below. Use the data to approximate the mean to the nearest tenth of a centimeter. Length Frequency 0-5 6 6-11 5 12-17 15 18-23 20 24-29 11 30-35 5 A) 18.4 cm B) 18.9 cm C) 10.3 cm D) 5.8 cm

A pollster randomly samples 152 Democrats, 155 Republicans and 17 Independents (all registered voters) in Metro City and asks each poll participant which mayoral candidate he or she prefers. Identify the kind of sample that the pollster is using. A) voluntary response sample B) stratified sample C) sample of convenience D) cluster sample

A population has a mean ȝ = 15 and standard deviation ı = 14. Find the z-score for a population value of 17. A) 1.2 B) 0.1 C) 7 D) 2

A section of an exam contains two multiple-choice questions, each with three answer choices (listed "A", "B", and "C"). List all the outcomes of the sample space. A) {AA, AB, AC, BB, BC, CC} B) {A, B, C} C) {AA, AB, AC, BA, BB, BC, CA, CB, CC} D) {AB, AC, BA, BC, CA, CB}

Approximate the sample variance given the following frequency distribution. Class Frequency 0 - 19 8 20 - 39 19 40 - 59 17 60 - 79 11 80 - 99 11 A) 642.1 B) 651.9 C) 25.5 D) 25.3

Determine which of the following describes qualitative data. i). the volume of a shipping container, in gallons ii). the name of the material from which the container is made iii). the shape of the container A) i and iii only B) ii and iii only C) i and ii only D) i, ii, and iii

For the event described below, which of the following represents the complement of the event? A sample of 323 software DVDs was selected. At least 31 of these were defective. A) Fewer than 31 DVDs were defective. B) Exactly 31 DVDs were not defective. C) At most 31 DVDs were defective. D) At most 292 DVDs were not defective

Gina and Stewart are surf-fishing on the Atlantic coast, where both bluefish and pompano are common catches. The mean length of a bluefish is 288 millimeters with a standard deviation of 63 mm. For pompano, the mean is 143 mm with a standard deviation of 30 mm. Stewart caught a bluefish that was 352 mm long. What was the z-score for this length? A) 6.97 B) 5.59 C) 1.02 D) 352

On a TV game show, a contestant is shown 10 products from a grocery store and is asked to choose the three least-expensive items in the set. The three chosen items need not be in any particular order. In how many ways can the contestant choose the three items? A) 120 B) 604,800 C) 6 D) 720

The numbers 1 through 8 are written in separate slips of paper, and the slips are placed into a box. Then, 4 of these slips are drawn at random. What is the probability that the drawn slips are "1", "2", "3", and "4", in that order? A) 0.01429 B) 0.01428 C) 0.000595 D) 0.34296

he probability that a certain make of car will need repairs in the first six months is 0.3. A dealer sells five such cars. What is the probability that at least one of them will require repairs in the first six months? A) 0.0024 B) 0.1681 C) 0.9976 D) 0.8319

Determine which of the following describes qualitative data A. The volume of a shipping container in gallons B. The name of the material from which the container is made C. The shape of the container

B and C

Which one of the following data are continuous A. The number of musicians performing on the MP3 file B. The time remaining for an MP3 music download C. The number of times the file has been downloaded D. All of these represent continuous data

B only

A published study looked at levels of a protein released when the heart is stressed. Researchers measured the protein levels in 1030 patients and followed their health for five years. People with the highest protein level were 1 1/4 times more likely to die from any cause than those with the lowest, The lead researcher said, "It sort of tells you that no matter what condition you have, higher levels of these proteins are associated with worse outcomes." Identify the population What is the population? A. The 1030 patients in the study B. All people C. Everyone with high levels of the protein D. Everyone with high levels of the protein E. Everyone with heart trouble

B. All people

A published study looked at levels of a protein released when the heart is stressed. Researchers measured the protein levels in 1030 patients and followed their health for five years. People with the highest protein level were 1 1/4 times more likely to die from any cause than those with the lowest, The lead researcher said, "It sort of tells you that no matter what condition you have, higher levels of these proteins are associated with worse outcomes." Identify the inferences of the study. What can be inferred from the study? A. Higher levels of the protein are associated with better outcomes. B. Higher levels of the protein are associated with worse outcomes. C. The level of protein as no effect on the likelihood of death.

B. Higher levels of the protein are associated with worse outcomes.

Determine which of the following describes quantitative data A. The name of a chemical sample B. The mass of a chemical sample C. The color of a chemical sample

B. The mass of a chemical sample

A study conducted by researchers was designed "to determine if application of duct tape is as effective as cryotherapy in the treatment of common warts."The researchers randomly divided 50 patients into two groups. The 25 patients in group 1 had their warts treated by applying duct tape. The 25 patients in group 2 had their warts treated by cryotherapy. Once the treatments were complete, it was determined that 74% of the patients in group 1 and 64% of the patients in group 2 had complete resolution of their warts. The researchers concluded that duct tape is significantly more effective in treating warts than cryotherapy. Identify the research objective. Which of the following is correct? A. To determine if duct tape is effective in treating warts. B. To determine if duct tape is as effective as cryotherapy in treating warts C. To determine if cryotherapy is effective in treating warts D. To determine if cryotherapy is as effective as duct tape in treating warts.

B. To determine if duct tape is as effective as cryotherapy in treating warts

A news service conducted a survey of 1000 adults ages 18 years or older in a certain country, August 31 - September 2, 2009. The respondents were asked, "Of every tax dollar that goes to the federal government, how many cents of each dollar would you say are wasted?" Of the 1000 individuals surveyed, 38% indicated that 51 cents or more is wasted. The news service reported that 38% of all adults in the country 18 years or older believe the federal government wastes at least 51 cents of each dollar spent, with a margin or error of 6% and a 95% level of confidence. What is the research objective? A. To determine the number of adults in the country who believe the federal government wastes 51 cents or more of every dollar. B. To determine the proportion of adults in the country who believe the federal government wastes 51 cents or more of every dollar C. To determine the number of adults in the country paying their taxes to the federal government D. To determine the number of adults in the country

B. To determine the proportion of adults in the country who believe the federal government wastes 51 cents or more of every dollar

Which of the following is the best description of a double-blind experiment? A. an experiment in which both the investigators and the subjects are hidden from the others' views B. an experiment in which neither the investigators nor the subjects know how the treatments have been assigned C. an experiment in which the subjects are blindfolded so they cannot see which treatment is applied to them D. an experiment in which neither the investigators nor the subjects know the others' names

B. an experiment in which neither the investigators nor the subjects know how the treatments have been assigned

Determine which of the following described nominal data. i. My favorite days of the week are Friday, Saturday, and Tuesday. ii. My favorite day of the week is Friday, my second-favorite is Saturday, and third-favorite is Tuesday. A. ii only B. i only C. both i and ii D. neither i nor ii

B. i only

Determine which of the following describes quantitative data. i). the length of an object in feet ii). the speed of an object in meters per second iii). the number of objects that are blue A. i only B. i, ii, and iii C. iii only D. i and ii only

B. i, ii, and iii

Determine which of the following describes qualitative data. i). the volume of a shipping container, in gallons ii). the name of the material from which the container is made iii). the shape of the container A. i and ii only B. ii and iii only C. i, ii, and iii D. i and iii only

B. ii and iii only

You ask your friends who they plan to vote for in the next congressional election. Based on their responses, you conclude that the candidate you favor cannot lose! This is most likely an example of ... A. randomized sampling B. sampling bias C. voluntary response bias D. self-interest bias

B. sampling bias

People are reluctant to admit to behavior that may reflect negatively on them. This can lead to ... A. hurt feelings B. social acceptability bias C. voluntary response bias D. sampling bias

B. social acceptability bias

An electronics manufacturer test every 1000th cell phone to verify that it is functioning properly. Identify the kind of sample that is being used. A. stratified sample B. systematic sample C. simple random sample D. cluster sample

B. systematic sample

The average resident of Metro City produces 570 pounds of solid waste each year, and the standard deviation is approximately 70 pounds. Use Chebyshev's theorem to find the weight range that contains at least of 75% all residents' annual garbage weights.

Between 430 and 710 pounds

Determine which of the following describes nominal data A. Michelangelos sell small medium large and jumbo pizzas B. Michelangelos most requested toppings or pepperoni black olives and mushrooms

Both A and B

Determine which of the following describes ordinal data A. In the horse race Betty's girl won Mr. Ed placed and Wabash showed B. In the horse race I bet on Betty's girl to win Mr. Ed to place and Wabash to show

Both A and B

A ________ is a number that describes a population. A) statistic B) summary C) parameter D) sample

A consumer advocacy group tested the "on-air" lifetimes of a random sample of 178 cell phone batteries. The mean lifetime was 2.7 hours with a standard deviation of 0.5 hours. The lifetimes are approximately bell-shaped. Estimate the number of batteries with lifetimes between 2.2 hours and 3.2 hours. A) 57 B) almost all (greater than 169) C) 121 D) 169

A survey asked respondents to indicate their level of satisfaction with government spending. The results are shown below. Response Number Very satisfied 608 Somewhat satisfied 3053 Dissatisfied 5303 Total 8964 Assume this is a simple random sample from a population. Use the Empirical Method to estimate the probability that a person is dissatisfied with government's spending? A) 0.635 B) 0.408 C) 0.33 D) 0.592

According to a survey, 81% of teenagers could recognize a picture of legendary film star John Wayne. What is the probability that a randomly-selected teenager could recognize John Wayne? A) 0.19 B) 0.81 C) 0.01 D) 0.23

Approximate the population standard deviation given the following frequency distribution. Class Frequency 0 - 19 9 20 - 39 19 40 - 59 17 60 - 79 1. 0 80 - 99 18 A) 27.5 B) 754.9 C) 27.3 D) 744.6

Gina and Stewart are surf-fishing on the Atlantic coast, where both bluefish and pompano are common catches. The mean length of a bluefish is 261 millimeters with a standard deviation of 59 mm. For pompano, the mean is 141 mm with a standard deviation of 39 mm. Stewart caught a bluefish that was 280 mm long, and Gina caught a pompano that was 167 mm long. Who caught the longer fish, relative to fish of the same species? A) Stewart B) Gina C) Neither. Relative to its respective species, the fish are the same length.

If P(A) = 0.45, P(B) = 0.43, and P(A or B) = 0.88, are A and B mutually exclusive? A) No B) Yes

In Steve's statistics class, the final grade is a weighted mean of a homework grade, three midterm grades, and a final exam grade. The homework counts for 5% of the grade, each midterm counts for 20%, and the final exam counts for 35%. Steve got an average score of 60 on the homework, 70, 60, and 80 on the midterms, and 70 on the final. What is Steve's final grade? A) 30 B) 67 C) 70 D) 68

On a TV game show, a contestant is shown 10 products from a grocery store and is asked to choose the three least-expensive items in the set, and then correctly arrange these three items in order of price. In how many ways can the contestant choose the three items? A) 6 B) 720 C) 120 D) 604,800

The completion times for a certain marathon race was 2.9 hours with a standard deviation of 0.6 hours. What can you determine about these data by using Chebyshev's Inequality with K = 3? A) At least 75% of the completion times are between 1.1 hours and 4.7 hours. B) No more than 88.9% of the completion times are between 1.1 hours and 4.7 hours. C) At least 88.9% of the completion times are between 1.1 hours and 4.7 hours. D) At most 75% of the completion times are between 1.1 hours and 4.7 hours.

The following frequency distribution presents the frequency of passenger vehicles that pass through a certain intersection from 8:00 AM to 9:00 AM on a particular day. Vehicle Type Frequency Motorcycle 5 Sedan 71 SUV 87 Truck 35 What is the relative frequency of the Truck category? A) 35 B) 35% C) 0.177 D) 0.402

The following frequency distribution presents the weights in pounds (lb) of a sample of visitors to a health clinic. Weight (lb) Frequency 140-147 2 148-155 4 156-163 8 164-171 3 172-179 8 180-187 7 188-195 5 196-203 2 What is the class width? A) 9 B) 64 C) 8 D) 7

The following table presents the heights (in inches) of a sample of college basketball players. Height (in.) Frequency 68 - 71 1 72 - 75 2 76 - 79 2 80 - 83 3 84 - 87 3 Considering the data to be a population, approximate the variance of the heights. A) 30.0 B) 5.5 C) 27.2 D) 5.2

The names of all 73 students in a professor's class are written on identical slips of paper, and the slips are placed into a large glass jar. Then, the professor selects 11 random slips from the jar. Identify the kind of sample that is being used. A) sample of convenience B) systematic sample C) simple random sample D) cluster sample

Which one of the following data are discrete? A) the average preseason ranking of the University of Connecticut's women's basketball team over the past 10 years B) the height of the tallest player on Duke University's men's basketball team C) the pre-season ranking of Duke University's men's basketball team D) the average height of players on the University of Connecticut's women's basketball team

Which one of the following data are discrete A. The speed of the boats propeller in revolutions per minute B. The latitude and longitude of a boat at sea C. The number of crewmembers on the boat D. The latitude and longitude of the boats port of departure

C only

It is extremely important for a researcher to clearly define the variables in a study because this helps to determine the type of analysis that can be performed on the data. For example, if a researcher wanted to describe hockey players based on jersey number, what level of measurement would the variable "Jersey number" be? Now suppose the researcher felt that certain player who were older received higher numbers. Does the level of measurement of the variable change? If so, how? What is the level of measurement of the variable "jersey number" in the original scenario? A. Ratio B. Interval C. Nominal D. Ordinal

C. Nominal

A published study looked at levels of a protein released when the heart is stressed. Researchers measured the protein levels in 1030 patients and followed their health for five years. People with the highest protein level were 1 1/4 times more likely to die from any cause than those with the lowest, The lead researcher said, "It sort of tells you that no matter what condition you have, higher levels of these proteins are associated with worse outcomes." Identify the descriptive statistics. Which of the following list the descriptive statistics for this study? A. The five years the patients were followed. B. The cause of death C. People with the highest levels of the protein were 1.25 times more like to die than those with the lowest levels. D.The 1030 patients in the study

C. People with the highest levels of the protein were 1.25 times more like to die than those with the lowest levels.

Which of the following is the best description of a randomized experiment? A. an experiment in which the experimental units are selected at random B. an experiment in which the investigators are chosen at random C. an experiment in which the treatments are assigned randomly to experimental units D. an experiment in which the outcomes are random

C. an experiment in which the treatments are assigned randomly to experimental units

The question... "Do you favor a higher standard of living, even though it produces unclean air and water?" ... is an example of ... A. random sampling B. framing C. leading question bias D. sampling bias

C. leading question bias

A ________ is a number that describes a population. A. sample B. statistic C. parameter D. summary

C. parameter

Please is an individual into one of the several groups or categories

Categorical variable

A magazine test a New car and reports that it could be twice as much fun to drive. This is not an example of

Changing the subject

...................... sampling is used when the population is large and it includes subjects residing a very large geographic area

Cluster

By visiting homes door to door , a municipality surveys all the households in 146 randomly selected neighborhoods to see how residence feel about a proposed property tax increase identify the type of sample that is being used

Cluster sample

By visiting homes door to door a municipality surveys all the households in 31 randomly selected neighborhoods to see how residents feel about a proposed property tax increase identify the type of sample that is being used A) sample of convenience B) cluster sample C) voluntary response sample D) Stratified sample

Cluster sample

Statistics is the sience of conducting studies to.....

Collect, organize, summarize analyze and draw conclusions from data

Determine whether the following data are discrete or continuous: The amount of caffeine in a cup of Starbucks coffee

Continuous

Determine whether the following data are discrete or continuous: The distance a person drives each day to work

Continuous

The amount of time needed to run the Boston marathon is an example of which type of variable

Continuous

A.................... makes it difficult to determine whether an experimental outcome is due to the applied treatment

Counfounder

A 12-sided die can be made from a geometric solid called a dodecahedron. Assume that a fair dodecahedron is rolled. The sample space is {1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12}. Find P(Less than 3). A) 1/4 B) 2/3 C) 1/6 D) 1/12

A survey asked 30,772 homeowners how many pets they owned. The results were as follows: Number of Pets Number of Homeowners 0 5585 1 10,778 2 8246 3 5561 4 or more 602 Total 30,772 What is the probability that a sampled homeowner has three pets? A) 0.2 B) 0.8 C) 0.02 D) 0.181

At the campus cafeteria, a diner can purchase a "meal deal" that consists of an entree, a side dish, and a dessert. There are 6 choices for the entree, 3 choices for the side dish, and 5 choices for dessert. How many different meal deals are possible? A) 14 B) 90 C) 63 D) 364

By visiting homes door-to-door, a municipality surveys all the households in 102 randomly-selected neighborhoods to see how residents feel about a proposed property tax increase. Identify the type of sample that is being used. A) systematic sample B) stratified sample C) voluntary response sample D) cluster sample

Compute the least-squares regression line for the given data set. x 3 4 5 6 7 8 y 11.8 15.5 15.3 19 22.4 25 A) y = 2.6400x + 3.9610 B) y = 3.9610x + 2.5829 C) y = 2.6400x + 11.8 D) y = 2.5829x + 3.9610

For this year's mayoral election, voter dissatisfaction is very high. In a survey of 700 likely voters, 231 said they planned to write in an independent candidate rather than vote for the Democrat or Republican candidate for mayor. What is the probability that a surveyed voter plans to write in an independent candidate? A) 0.67 B) 0.7 C) 0.231 D) 0.33

If P(A) = 0.5, P(B) = 0.3, and A and B are mutually exclusive, find P(A or B). A) 0.4 B) 0 C) 0.8 D) 0.2

In a poll of 791 university students, 332 said that they were opposed to legalizing marijuana. Estimate the percentage of students who oppose legalizing marijuana. A) 72.3% B) 58% C) 27.7% D) 42%

Nanette must pass through three doors as she walks from her company's foyer to her office. Each of these doors may be locked or unlocked. Let B be the event that exactly two doors are locked. List the outcomes of B. [Let "L" designate "locked" and "U" designate "unlocked".] A) {LLU, LUL, ULL} B) {LLU, LUL, ULL, LUU, ULU, UUL} C) {LLL, LLU, LUL, LUU, ULL, ULU, UUL, UUU} D) None of these.

One of the primary feeds for beef cattle is corn. The following table presents the average price in dollars for a bushel of corn and a pound of ribeye steak for 10 consecutive months. Corn Price ($/bu) Ribeye Price ($/lb) 5.88 12.51 6.53 13.44 6.63 14.16 5.86 12.37 5.74 12.05 5.91 11.98 The least-squares regression line for predicting the ribeye price from the corn price is y = -0.3591 + 2.1522x. Predict the ribeye price in a month when the corn price was $6.42 per bushel. A) $14.84 per lb B) $12.79 per lb C) $13.46 per lb D) $13.82 per lb

There are 27,565 undergraduate students enrolled at a certain university. The age distribution is as follows: Age Range Number 13 - 14 7 15 - 17 431 18 - 22 11,161 23 - 30 9327 31 and up 6639 Total 27,565 What is the probability that a student is less than 18 years old? A) 0.0159 B) 0.00025 C) 0.241 D) 0.0156

What is the correct relationship between events A and B? A: Laura participated in an out-of-town volleyball game at 11:00 AM last Friday. B: Laura met with her academic advisor on campus at 11:00 AM last Friday. A) A and B are mutually exclusive. B) A and B are complementary. C) A and B are not mutually exclusive. D) If B is true, A is true.

Which one of the following data are continuous A. The rankings of the trees from most numerous to least numerous B.The Number of representatives of each species in the park C. The number of species of trees in a park D. The average height of a sample of trees

D only

D. Adults in the country aged 18 years or older.

A quality-control manager randomly selects 50 bottles of tomato sauce that were filled on October 11 to assess the calibration of the filling machine. What is the population in the study? A. The 50 bottles of tomato sauce produced in the plant on October 11 B. The 50 bottles of tomato sauce produced in the plant C. Bottles of tomato sauce produced in the plant. D. Bottles of tomato sauce produced in the plant on October 11

D. Bottles of tomato sauce produced in the plant on October 11

A news service conducted a survey of 1000 adults ages 18 years or older in a certain country, August 31 - September 2, 2009. The respondents were asked, "Of every tax dollar that goes to the federal government, how many cents of each dollar would you say are wasted?" Of the 1000 individuals surveyed, 38% indicated that 51 cents or more is wasted. The news service reported that 38% of all adults in the country 18 years or older believe the federal government wastes at least 51 cents of each dollar spent, with a margin or error of 6% and a 95% level of confidence. List the descriptive statistics. Choose he correct answer below A. The news service conducted a survey of 1000 adults ages 18 years or older in a certain country, August 31 - September 2, 2009. B. There is a 95% chance surveying 1000 individuals from this country will result in a response that matches how the entire country would respond. C. The federal government wastes 51 cents or more of every dollar they receive. D. Of the 1000 individuals surveyed, 38% indicated that 51 cents or more is wasted.

D. Of the 1000 individuals surveyed, 38% indicated that 51 cents or more is wasted.

D. The 1000 adults in the country that were surveyed.

A published study looked at levels of a protein released when the heart is stressed. Researchers measured the protein levels in 1030 patients and followed their health for five years. People with the highest protein level were 1 1/4 times more likely to die from any cause than those with the lowest, The lead researcher said, "It sort of tells you that no matter what condition you have, higher levels of these proteins are associated with worse outcomes." What is the sample? A. Everyone with high levels of the protein B. Everyone who has the protein C. Everyone with heart trouble D. The 1030 patients in the study

D. The 1030 patients in the study

A study conducted by researchers was designed "to determine if application of duct tape is as effective as cryotherapy in the treatment of common warts."The researchers randomly divided 50 patients into two groups. The 25 patients in group 1 had their warts treated by applying duct tape. The 25 patients in group 2 had their warts treated by cryotherapy. Once the treatments were complete, it was determined that 74% of the patients in group 1 and 64% of the patients in group 2 had complete resolution of their warts. The researchers concluded that duct tape is significantly more effective in treating warts than cryotherapy. Identify the sample. Which of the following is correct? A. The 25 patients in group 1 B. The 25 patients in group 2 C. All people who have warts D. The 50 patients with warts E. The total number of patients with complete resoltion

D. The 50 patients with warts

The Gallup Organization contacts 1952 undergraduates who attend a university and live in the United States and asks whether or not they had spent more than $200 on food in the last month. What is the population in the study? A. Undergraduates who attend a university and live in the United States and have spent more than $200 on food. B. Undergraduates who attend a university. C. Undergraduates who attend a university and have spent more than $200 on food. D. Undergraduates who attend a university and live in the United States.

D. Undergraduates who attend a university and live in the United States.

A pollster randomly samples 159 Democrats, 151 Republicans and 16 Independents (all registered voters) in Metro City and asks each poll participant which mayorial candidate he or she prefers. Identify the kind of sample that the pollster is using. A. voluntary response sample B. cluster sample C. sample of convenience D. stratified sample

D. stratified sample

Which one of the following data are continuous? A. the rankings of the trees, from most numerous to least numerous B. the number of species of trees in a park C. the number of representatives of each species in the park D. the average height of a sample of trees

D. the average height of a sample of trees

Which one of the following data are discrete? A. the latitude and longitude of the boat's port of departure B. the speed of the boat's propeller, in revolutions per minute C. the latitude and longitude of a boat at sea D. the number of crew members on the boat

D. the number of crew members on the boat

Which of the following is true?

D5 = P50 = Q2

Each value in a data set may be referred to as either a data value or a

Datum

If we decrease the confidence level and keep the same sample size, we ________the margin of error

Decrease

If we decreased the confidence level and keep the same sample size, we _______the margin of error

Decrease

In which branch of statistics would a researcher acquire twenty-five 2000 Toyota celicas Drive them until they had a major mechanical failure record the final mileage and then write a report for car and driver

Descriptive statistics

And advertisement for a pick up truck states that it is 30% more powerful. This is an example of............

Detached statistics

In an advertisement for a car, hey driver is shown driving expertly through a difficult road course. At the bottom of the ad, The following is included in small print "professional driver on a closed course". What best describes this misuse of data?

Detached statistics

A ........... variable assumes values that can be counted

Discrete

If a researcher manipulates one of the variables and tries to determine how the manipulation influences other variables the researcher is conducting what kind of study

Experimental study

An Independent variable can also be called......

Explanatory variable

A persons hair color would be an example of a quantitative variable true or false

False

Based on her electric bills from last year miss Smith expects she will be paying $75 a month this year this is an example of descriptive statistics true or false

False

If a distribution is negatively skewed as shown in the figure below, the mean will fall to the right of the median and the mode will fall to the left of the median.

False

In a research study it is always preferable for the researcher to carefully choose his participants rather than randomly select them from a suitable group true or false

False

Quantitative data can be further classified as continuous or nonsequential true or false

False

The Number of birds in a tree is an example of a continuous variable true or false

False

The four basic methods used to obtain samples are:random, irregular,cluster,and stratified sampling true or false

False

The interquartile range IQR is found by subtracting the mean from the maximum value of a data set.

False

Two events are mutually exclusive if both events can occur.

False

Gina and Stewart are surf-fishing on the Atlantic coast, where both bluefish and pompano are common catches. The mean length of a bluefish is 288 millimeters with a standard deviation of 63mm. For pompano, the mean is 128mm with a standard deviation of 31. Stewart caught a bluefish that was long 307mm, and Gina caught a pompano that was 189mm long. Who caught the longer fish, relative to fish of the same species?

Gina

.................... is a decision-making process for evaluating claims about a population based on information obtained from samples

Hypothesis testing

In an experimental study manipulation of the................... variable is studied to see if it leads to changes in the..................variable

Independent......dependent

The objects described by a set of data

Individuals

Which branch of statistics would employ probability to predict how many miles one should be able to drive a 2000 Toyota celica during its lifetime

Inferential statistics

Determine the level of measurement of the variable: Time of day measured in military time

Interval

What level of measurement would be applied when doing a survey on the average American's shoe size

Interval level of measurement

Determine which of the following describes ordinal data A. My best friends or Georgia Amy and mike B.my favorite Numbers or 2, 7 and 13

Neither A or B

Classifying the fruit and I basket as apple orange or banana is an example of the ....... level of measurement

Nominal

Determine the level of measurement of the variable: Dress color

Nominal

Determine the level of measurement of the variable: Favorite type of music

Nominal

Determine whether the following is nominal or ordinal: The topping on a pizza includes mushrooms, onions, peppers and pineapple

Nominal

What level of measurement classifies data into mutually exclusive categories in which no order or ranking can be imposed on the data

Nominal

A data set contains three unique values. Which of the following must be true?

None of these

One advantage of a.................... Study is that it occurs in a natural setting without intervention by the researcher

Observational

Determine whether the following is nominal or ordinal: Strongly disagree, disagree, neutral, agree, strongly agree

Ordinal

The .................. level of measurement classifies data into categories that can be ranked; however precise differences between the ranks do not exist

Ordinal

A________Is a numerical summary of a population

Parameter

The average age of the employees in a certain company is 35 years old A) statistic B) parameter

Parameter

Determine whether the given value is a statistic or a parameter: For a certain movie, 72 of the 112 members of the audience were females

Parameter, because the data set of all 112 audience members is a population

The following frequency distribution presents the frequency of passenger vehicles that pass through a certain intersection from 8:00 AM to 9:00 AM on a particular day Vehicle Type - Frequency Motorcycle ------15 Sedan -----------85 SUV -------------50 Truck ------------25 Construct a frequency bar graph for the data.

Passenger Vehicles Frequency 90 ---------------------------------- 80---------___------------------------ 70----------------------------------- 60----------------------------------- 50-___-------------------------------- 40------------------------------------ 30------------------------------------ 20-----------------___----------------- 10 ----------------------------___----- 0-------------------------------------- ---SUV--Sedan--Truck--Motorcycle

The following frequency distribution presents the frequency of passenger vehicles that pass through a certain intersection from 8:00 AM to 9:00 AM on a particular day. Vehicle Type - Frequency Motorcycle --------5 Sedan -------------33 SUV ----------------61 Truck --------------30 Construct a relative frequency Pareto chart for the data.

Passenger Vehicles Relative Frequency 0.5 -____-------------------------- 0.4-------------------------------- 0.3-------_____---------------------- 0.2---------------____------------- 0.1-------------------------_____---- 0.0-------------------------------- ----SUV Sedan Truck Motorcycle

A.................. consists of all subjects that are being studied

Population

The entire collection of individuals about which information is being sought is called a__________ A) sample B) population C) parameter D) Statistic

Population

Determine whether the following is qualitative or quantitative: your best friends name

Qualitative

Variables that classify individuals into categories are called________ A) quantitative B) qualitative

Qualitative

When rolling two six- sided dice your total roll ranges from 2(double ones) to 12 (double sixes). Characterize the nature of the roll total.

Quantitative and discrete

Takes numerical values for which arithmetic operations such as adding and averaging makes sense

Quantitative variable

In a true experimental study the subjects should be assigned to groups randomly if this is not possible in a researcher uses intact groups they are performing a...........

Quasi-experimental study

If a weather center monitors and calculates the average number of tornadoes that pass through Topeka Kansas each year what type of variable would they be investigating

Random variable

Variables with values that are determined by chance are called

Random variables

In an experiment subjects are put into two categories according to sex and then each subject is randomly assigned a treatment. this is an example of.........

Randomized blocking

Determine the level of measurement of the variable: Height of a child: 29 in, 30 in, 31 in, 32 in and 33 in.

Ratio

Determining the number of people from the state of Alaska who voted for a Republican in the last election is an example of..............measurement

Ratio

What level of measurement allows for the ranking of data,a precise difference between units of measure ,and also includes a true zero?

Ratio

The following frequency distribution presents the frequency of passenger vehicles that pass through a certain intersection from 8:00 AM to 9:00 AM on a particular day. Vehicle Type - Frequency Motorcycle --------6 Sedan -------------26 SUV ---------------30 Truck --------------21 Construct a pie chart for the data.

SUV 36.1% Sedan 31.3% Truck 25.3% Motorcycle 7.2%

A middle school student passes out leaflets to the adults at a school function. The leaflets ask the recipient to indicate whether they believe in global warming. The bottom of the leaflet indicates that the completed leaflet should be returned to the student. identify the kind of sample that is being used

Sample of convenience

A middle school student passes out leaflets to the adults at a school function. The leaflets asks the recipient to indicate whether they believe in global warming. The bottom of the leaflet indicates that the completed leaflet should be returned to the student. Identify the kind of sample that is being used A) voluntary response sample B) systematic sample C) sample of convenience D) Stratified sample

Sample of convenience

The names of all 106 students in a professors class arewritten on identical slips of paper and the slips are placed into a large glass jar. Then the professor selects 11 random slips from the jar. Identify the kind of sample that is being used

Simple random sample

The names of all 35 students in a professors class are written on identical slips of paper and the slips are placed into a large glass jar then the professor selects 10 random slips from the jar identify the kind of sample that is being used A) stratified sample B) Simple random sample C) Sample of convenience D) systematic sample

Simple random sample

simple random sample

Size and consists of n individual's from the population chosen in such a way that every set of n individual has an equal chance to get the sample actually selected

Classify the histogram as skewed to the left, skewed to the right, or approximately symmetric. |-----___--------------------- |---------------------------- | ------------___------------- | ---------------___---------- | ---------------------------- | -------------------___-------- |----------------------------- | ------------------------___--- | -----------------------------___ _________________________________________

Skewed to the right

A_______ Is a numerical summary of a sample

Statistic

Determine whether the given value is a statistic or a parameter: A sample of employees is selected and it is found that 45% own a vehicle.

Statistic because the value is a numerical measurement describing a characteristic of a sample

Determine whether the underlined numerical value is a parameter or a statistic. A survey of 42 out of hundreds in a dining hall showed that 17 enjoyed their meal

Statistic, because the data set of 42 people in the dining hall is a sample.

Determine whether the underlined numerical value is a parameter or a statistic. In the survey of sample of 1050 teenagers, 17% said they like to watch soccer

Statistic, because the data set of a sample of 1050 teenagers is a sample.

A college faculty consist of 400 men and 250 woman the college administration wants to draw a sample of 65 faculty members to ask their opinion about a new parking fee they draw a simple random sample of 40 men and another simple random sample of 25 woman what type of sample is this A) sample of convenience B) systematic C) stratified D) Cluster

Stratified

A pollster randomly samples 135 democrats 164 Republicans and 16 independents (all registered voters) in metro city and ask each pole participant which mayorial candidate he or she prefers. What kind of sampling is the pollster using

Stratified sample

A pollster randomly samples 145 Democrats, 138 Republicans and 24 independents in metro city and asks each poll participant which candidate he or she prefers for mayor. Identify the kind of sample that the poster is using A) cluster sample B) voluntary response sample C) stratified sample D) Sample of convenience

Stratified sample

What type of sampling is being employed if the country is divided into economic classes and a sample is chosen from each class to be surveyed

Stratified sampling

A television station interviews five movie viewers after The first showing of a movie. After finding out that all five enjoyed the movie very much, The reporter states that this movie will definitely be a big hit. This is an example of............

Suspect samples

And electronics manufacturer test every 1000th cell phone to verify that it is functioning properly. Identify the type of sample that is being used

Systematic sample

In electronics manufactured has every 15th cell phone to verify that it is functioning properly identify the kind of sample that is being used A) sample of convenience B) stratified sample C) Voluntary response sample D) systematic sample

Systematic sample

Describe the relationship between confounding, dependent and independent variable's

The confounding variable influences the dependant variable but is not separated from the independent variable

R value when all points lie exactly on a straight line:

The correlation coefficient R equals one

R value when the linear association between the variables is weak:

The correlation coefficient r is close to zero

R-value when larger values of one variable correspond to smaller values of the other variable

The correlation coefficient r is negative

R-value when larger values of one variable correspond to larger values of the other variable:

The correlation coefficient r is positive

Given the following boxplot where m is the median value, what statement could be made about the distribution of the data?

The distribution is approximately symmetric.

Confounding

The effect of two factors (explanatory variables on the response variable) cannot be distinguished

Response Variable

The quantitative or qualitative variable for which the experimenter wishes to determine how its value is affected by the explanatory variable

In a randomized experiment if there are large differences in outcomes Among the treatment groups we can conclude that the differences are due to

The treatments

Determine whether the given value is a statistic or a parameter: Following the election, 18% of the governors of all 50 areas of a country were female.

The value is a parameter because the governors of all 50 area or a country are a population

Factor

The variable whose effect on the response variable is to be assessed by the experimenter

How are statistics important in our everyday lives, and why do we need to understand them

To analyze the results of surveys to understand the terms and concept so that one can understand exactly what is being represented or misrepresented

A dependent variable can also be referred to as an outcome variable true or false

True

Inferential statistics is based on probability

True

Questioning every 14th customer leaving a theater about the movie they have seen would be an example of systematic sampling true or false

True

Rating a restaurant by a number of stars is an example of an ordinal level of measurement true or false

True

The variable of height is an example of a quantitative variable true or false

True

When running an experimental study the group that is manipulated can be called the treatment group true or false

True

Classify the histogram as unimodal or bimodal. | ----------____----------- | ------------------------ | ------____--------------- | --------------___-------- | ------------------------- | ------------------____---- |----___-------------------- | -----------------------___ | ____----------------------___ _________________________________________

Unimodal

A ................. is a characteristic or attribute of a subject that can assume different values

Variable

The following frequency distribution presents the frequency of passenger vehicles that pass through a certain intersection from 8:00 AM to 9:00 AM on a particular day. Vehicle Type - Frequency Motorcycle -------13 Sedan -------------78 SUV ---------------88 Truck --------------35 Construct a relative frequency distribution for the data.

Vehicle Type - Frequency Motorcycle ---- 0.061 Sedan ----------0.364 SUV -------------0.411 Truck -----------0.164

What sample type should you always regard as unreliable

Voluntary response samples

Decreasing the sample size while keeping the confidence level the same will result in a _________confidence interval

Wider

Determine whether each set of events are mutually exclusive. ____A sample of 10 books is selected from the library.A: At least one of the authors is male.B: None of the authors are male. ____A: Kayden works all day on Thursday.B: Kayden plays soccer on Thursday. ____A: Jenna is a senior in college.B: Jenna is taking a math class. ____A: Bobby works at Starbucks.B: Bobby plays the piano. 1.Mutually Exclusive 2.Not Mutually Exclusive

__1__A sample of 10 books is selected from the library.A: At least one of the authors is male.B: None of the authors are male. __1__A: Kayden works all day on Thursday.B: Kayden plays soccer on Thursday. __2__A: Jenna is a senior in college.B: Jenna is taking a math class. __2__A: Bobby works at Starbucks.B: Bobby plays the piano.

A sample of 200 Internet uses was selected. Identify the complement of each event. ____Fewer than 200 use Google ____No more than 200 use Google ____At least one uses Google ____More than 200 use Google ____At least 200 use Google ____None of them use Google 1.200 or less use Google 2.Less than 200 use Google 3.200 or more use Google 4.More than 200 use Google 5.At least one uses Google 6.None of them use Google

__3__Fewer than 200 use Google __4__No more than 200 use Google __6__At least one uses Google __1__More than 200 use Google __2__At least 200 use Google __5__None of them use Google

Given an event A, the event that A does not occur is called the [complement] and is denoted by P(Ac). The Rule of Complements states that P(Ac) = [1 - P(A)]. ____Rule of Complements ____P(A or B) ____Complement of A ____Mutually exclusive 1.= P(A) + P(B) - P(A and B) 2.Means that P(A and B) = 0 3.The event that A does not occur 4.P(Ac) = 1 - P(A)

__4__Rule of Complements __1__P(A or B) __3__Complement of A __2__Mutually exclusive

parameter

a numerical summary of a population

statistic

a numerical summary of a sample

Assuming the population is bell-shaped, approximately what percentage of the population values are between 39 and 63?

almost all (greater than 95%)

best description of a double - blind experiment

an experiment in which neither the investigators nor the subjects know how the treatments have been assigned

best description of a randomized experiment

an experiment in which the treatments are assigned randomly to experimental units

An experiment that tends to overestimate or underestimate the true value is said to be ______________

biased

Which of the following sample types should you always regard as unreliable? A) stratified samples B) cluster samples C) voluntary response samples D) simple random samples

continuous variables

can take on any value in some interval

qualitative data

classify into categories (color, shape, odor, other physical characteristics

By visiting homes door to door, a municipality surveys all the households in the 149 randomly-selected neighborhoods to see how residents feel about a propose property tax increase. Which kind of sample is being used?

cluster sample

A ________________________ makes it difficult to determine whether an experimental outcome is due to the applied treatment

confounder

Descriptive Statistics

consists of organizing and summarizing information collected

nominal variables

do not have a natural ordering

Variable Ratio Level

has the properties of the internal level of measurement and the ratios of the values of the variable have meaning.

Variable Ordinal Level

has the properties of the nominal level or measurement, but the naming scheme allows for the values of the variable to be arranged in a ranked or specific order

Variable Internal Level

has the properties of the ordinal level of measurement and the differences in the values of the variable have meaning.

ordinal variables

have a natural ordering

ordinal data

in the horse race, betty's girl won, mr. ed placed, and wabash showed. in the horse race, i bet on betty's girl to win, mr. ed to place, and wabash to show.

The size of the box in a boxplot shows the ________ of the data set.

interquartile range

The question... "Do you favor a higher standard of living, even though it produces unclean air and water?" is an example of

leading question bias

the question: "do you favor a higher standard of living, even though it produces unclean air and water?" this is an example of...

leading question bias

If a distribution is skewed to the left

mean is less than median

Observational Study

measures the value of the response variable without attempting to influence the value of either the response or explanatory variables. That is, in an observational study, the researcher observes the behavior of the individuals without trying to influence the outcome of the study.

For the data shown in the histogram, which of the following choices best describes the relationship between the median and the mean?

median ≈ mean

nominal data

michaelangelo's sells small, medium, large, and jumbo pizzas. michaelangelo's most requested toppings are pepperoni, black olives, and mushrooms.

A small brew pub sent out questionnaires to a simple random sample of of 250 customers asking whether they would like the brewery to include an imperial stout in their regular offerings. Of the 250 questionnaires, 12 were returned and 10 of those were in favor of including the stout. What is the type of bias involved?

nonresponse

parameter

number that describes a population

statistic

number that describes a sample

quantitative data

numbers

In an experiment, the __________ is what is measured on each experimental unit.

outcome

in an experiment the _________ is what is measured on each experimental unit.

outcome

A characteristic or measure obtained by using all the data values for a specific population is called a .

parameter

In a small town, 84% of the residents, aged 16 or more years old, own a car. Statistic or parameter?

parameter

Of the televisions offered at the electronics store, 42% cost less than $500. Statistic or parameter?

parameter

a number that describes a population

parameter

discrete variables

possible values can be listed

A middle school student passes out leaflets to the adults at a school function. The leaflets ask the recipient to indicate whether they believe in anthropogenic global warming. The bottom leaflet indicates that the completed leaflet should be returned to the student. What kind of sample is being used?

sample of convenience

you ask your friends who they plan to vote for in the next congressional election. based on their responses, you conclude that the candidate you favor cannot lost....... this is most likely an example of...

sampling bias

A sign in a grocery store claims that 92% of their customers believe them to have the freshest produce in the city. What is the type of bias involved?

self - interest

the name of all 130 students in a professor's class are written on identical slips of paper, and the slips are placed into a large glass jar. then, the professor selects 5 random slips from the jar. identify the kind of sample that is being used.

simple random sample

People are reluctant to admit to behavior that may reflect negatively on them. This can lead to __________.

social acceptability bias

In a recent poll, 64% of the respondents supported stricter gun laws. Statistic or parameter?

statistic

a number that describes a sample

statistic

A pollster randomly samples 145 democrats, 154 republicans, and 19 independents (all registered voters) in Metro City and asks each poll participant which mayoral candidate he or she prefers. What kind of sample is the pollster using?

stratified sample

a pollster randomly samples 159 democrats, 151 republicans and 16 independents (all registered voters) in metro city and asks each poll participant which mayoral candidate he or she prefers. identify the kind of sample that the pollster is using.

stratified sample

When experimental units are people, they are sometimes called _________

subjects

discrete data

the pre-season ranking of Duke University's Men's basketball team.

continuous data

the time remaining for an MP3 music download.

In a randomized experiment, if there are large differences in outcomes among the treatment groups, we can conclude that the differences are due to ________________

the treatments

Variable Nominal Level

the values of the variable name, label, or categorize

For a set of data with a mean of 6 and a variance of 9, approximately 68% of the values will fall between 3 to 9.

true

Inferential Statistics

uses methods that generalize results obtained from a sample to the population and measure the reliability of the results

Any characteristic of an individual

variable

A radio talk show invites people to call in and state whether or not they think that sexual harassment in the work place is a common problem. What is the type of bias involved?

voluntary response

Which of the following samples should you always regard as unreliable?

voluntary response samples

Tingnan ang lahat ng mga set ng pag-aaral

stats ma260

Kaugnay na mga set ng pag-aaral

LAH Exam

Chapter 5, Lessons 2 and 3 Egypt Test

Ética

Exam 2 Life on Earth (practice quiz)

"Who was George Washington?" by Roberta Edwards vocab words

chapter 9Which statement MOST accurately describes the microbial death rate after cells are exposed to a microbicidal agent?

Chapter 4 - Methods and Encapsulation

Pharmacology and Intravenous Therapies

Historical Antecedent (Part 1)

ch 2

LEGL TEST 3 - CH 17

Mandated Reporter: Child Abuse and Neglect

Kines test 1

Tarsiers

Medical Insurance Final Exam Review

Psych of Childhood 3550 Exam 3

chapter 5-6

10th Grade Spelling Vocab Review Units 7-9

minors and the baker act

Macro HW 6