Statistics Test 1

Out of 300 applicants for a job, 145 are male and 51 are male and have a graduate degree. Step 2 of 2: If 94 of the applicants have graduate degrees, what is the probability that a randomly chosen applicant is male, given that the applicant has a graduate degree? Express your answer as a fraction or a decimal rounded to four decimal places.

51/94

Suppose that grade point averages of undergraduate students at one university have a bell-shaped distribution with a mean of 2.61 and a standard deviation of 0.39. Using the empirical rule, what percentage of the students have grade point averages that are between 1.83 and 3.39?

95% see question 45

Consider the following sets of sample data: A: 20,165, 20,873, 20,480, 22,074, 22,228, 20,612, 20,154, 20,052, 21,762, 21,479, 22,023, 20,010, 21,871, 21,779 B: 4.73, 4.56, 4.30, 3.28, 4.20, 4.78, 4.35, 3.57, 4.50, 4.79, 4.04 Step 1 of 2: For each of the above sets of sample data, calculate the coefficient of variation, CV. Round to one decimal place.

A= 4% B= 11%

An experiment in which neither nurses nor partakers know whether the partaker will receive a treatment is .

Double-blind

Determine whether an observational or experimental study is appropriate to address the following statement. A gift shop owner wants to study if using a new cleaning product will reduce staffing costs.

Experimental

The mean salary at a local industrial plant is $27,700 with a standard deviation of $4400. The median salary is $27,100 and the 58th percentile is $28,800. Step 1 of 5: Based on the given information, determine if the following statement is true or false. Approximately 58% of the salaries are above $28,800.

False see question 45

The mean salary at a local industrial plant is $27,700 with a standard deviation of $4400. The median salary is $27,100 and the 58th percentile is $28,800. Step 3 of 5: Based on the given information, determine if the following statement is true or false. The percentile rank of $27,300 is 50.

False see question 45

Determine whether the following events are mutually exclusive. Choosing a heart or a black card out of a standard deck of cards.

Mutually Exclusive

Determine whether the statement describes a population or a sample. The amount of money each person in your statistics class spends on books in a semester.

Population

Determine if the numerical value describes a population parameter or a sample statistic. 59% of all freshmen at your school reside on campus.

Population Parameter

Classify the following data. Indicate whether the data is qualitative or quantitative, indicate whether the data is discrete, continuous, or neither, and indicate the level of measurement for the data. A supervisor must give a summary evaluation rating from among the choices given below: 1) Poor 2) Fair 3) Good 4) Very good 5) Excellent

Qualitative, Neither, Ordinal

Classify the following data. Indicate whether the data is qualitative or quantitative, indicate whether the data is discrete, continuous, or neither, and indicate the level of measurement for the data. The IQ scores of students at the local college.

Quantitative, Discrete, Interval

Determine whether the statement describes a population or a sample. The midterm exam scores of 6 out of the 20 students in your chemistry class.

Sample

Errors in a study resulting from the way the sample was chosen are called .

Sampling Errors

Identify the sampling technique used for the following study. A school administrator gathers data from one hundred students using a random number generator to select student IDs.

Simple Random Sampling

Identify the sampling technique used for the following study. First, the population is subdivided by class. Then a college student uses a random number generator to select fifteen members from each class to study.

Stratified Sampling

Identify the sampling technique used for the following study. A market researcher interviews every other member from the entire sampling frame.

Systematic Sampling

The mean salary at a local industrial plant is $27,700 with a standard deviation of $4400. The median salary is $27,100 and the 58th percentile is $28,800. Step 2 of 5: Based on the given information, determine if the following statement is true or false. Joe's salary of $32,540 is 1.10 standard deviations above the mean.

True see question 45

The mean salary at a local industrial plant is $27,700 with a standard deviation of $4400. The median salary is $27,100 and the 58th percentile is $28,800. Step 4 of 5: Based on the given information, determine if the following statement is true or false. Approximately 8% of the salaries are between $27,100 and $28,800.

True see question 45

Decide if the following statement is true or false. Explain why. It is possible to have a standard deviation of 450,000.

True; the standard deviation can be any value greater than or equal to zero.

Identify the sampling technique used for the following study. A pollster interviews the first fifteen members to arrive.

convenience Sampling

Consider the following data. −7,1,3,−7,1,3 Step 3 of 3: Determine if the data set is unimodal, bimodal, multimodal, or has no mode. Identify the mode(s), if any exist.

no mode

A(n) is a participant who does not follow the instructions for a study.

non adherent

What is the probability that a randomly selected person will have a birthday in October? Assume that this person was not born in a leap year. Express your answer as a simplified fraction or a decimal rounded to four decimal places.

number of days in October/total number of days in a year

Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.33 and a standard deviation of 1.48. Using the empirical rule, what percentage of American women have shoe sizes that are at least 12.77? Please do not round your answer.

see phone

Determine the relative frequency for the fourth class as a simplified fraction.

see question 21

Determine the relative frequency for the second class as a simplified fraction.

see question 21

Consider the bar graph, which shows the numbers and percentages of bachelor's degrees in engineering and engineering technologies earned by women at U.S. schools. Determine the ratio of the number of men to the number of women earning bachelor's degrees in engineering and engineering technologies in 1990-91. Please enter your answer as decimal number, rounded to two decimal places.

see question 27

For the graph shown, determine which letter represents the mean, the median, and the mode. Letters may be used more than once. ABC

see question 35

Lionel has just received his monthly credit card statement. He placed 7 charges on his card in the last month with a mean of $25.07 per charge. He knows that 6 of the charges were as follows: $27.60,$28.76,$28.00,$28.75,$25.29,$22.39 Determine the amount of the 7th charge.

see question 37

The mean salary at a local industrial plant is $27,700 with a standard deviation of $4400. The median salary is $27,100 and the 58th percentile is $28,800. Step 5 of 5: If Tom's salary has a z-score of 0.6, how much does he earn (in dollars)?

see question 45

You decide to record the hair colors of people leaving a lecture at your school. What is the probability that the next person who leaves the lecture will have brown hair? Express your answer as a simplified fraction or a decimal rounded to four decimal places. Blonde Red Brown Black Gray 42 51 34 17 35

see question 49

A card is drawn from a standard deck of 52 playing cards. What is the probability that the card will be a heart or a club? Express your answer as a fraction or a decimal number rounded to four decimal places.

see question 53

A pizza delivery company classifies its customers by gender and location of residence. The research department has gathered data from a random sample of 1384 customers. The data is summarized in the table below. Gender and Residence of Customers Residence Males Females Apartment 84 98 Dorm 285 54 With Parent(s) 216 67 Sorority/Fraternity House 274 81 Other 84 141 What is the probability that a customer is female and lives in 'Other' or is male and lives in an apartment? Express your answer as a fraction or a decimal number rounded to four decimal places.

see question 55

You are getting a line-up ready for a school kickball game. You have 6 girls and 6 boys. The rules state each child must kick the same number of times and alternate girl-boy or boy-girl. How many ways can a line-up be made for one round of kicking?

see question 61

In how many ways can the letters in the word 'Alabama' be arranged?

see question 62

Reginald wants to buy a new collar for each of his 3 dogs. The collars come in a choice of 7 different colors. Step 1 of 2: How many selections of collars for the 3 dogs are possible if repetitions of colors are allowed?

see question 65

Reginald wants to buy a new collar for each of his 3 dogs. The collars come in a choice of 7 different colors. Step 2 of 2: How many selections of collars are possible if repetitions of colors are not allowed?

see question 65

A coin is tossed 5 times. What is the probability that the number of tails obtained will be at most 4? Express your answer as a fraction or a decimal number rounded to four decimal places.

see question 67.

Jack is picking out some movies to rent, and he is primarily interested in mysteries and foreign films. He has narrowed down his selections to 20 mysteries and 10 foreign films. Step 1 of 2: How many different combinations of 4 movies can he rent?

see question 68

Jack is picking out some movies to rent, and he is primarily interested in mysteries and foreign films. He has narrowed down his selections to 20 mysteries and 10 foreign films. How many different combinations of 4 movies can he rent if he wants at least one foreign film?

see question 68

A doctor gives a placebo to the .

Control group

A standard six-sided die is rolled. What is the probability of rolling a number equal to 5? Express your answer as a simplified fraction or a decimal rounded to four decimal places.

1/6

A box contains 16 green marbles and 12 white marbles. If the first marble chosen was a white marble, what is the probability of choosing, without replacement, another white marble? Express your answer as a fraction or a decimal number rounded to four decimal places.

11/27 see question 58

Consider the following frequency table representing the scores on a test. Scores on a Test Class Frequency 60-80 2 81-101 12 102-122 3 123-143 11 144-164 3 Step 1 of 5: Determine the lower class boundary for the fourth class.

122.5 see question 30

Consider the following frequency table representing the scores on a test. Scores on a Test Class Frequency 60-80 2 81-101 12 102-122 3 123-143 11 144-164 3 Step 2 of 5: Determine the upper class boundary for the third class.

122.5 see question 30

Consider the following frequency table representing the scores on a test. Scores on a Test Class Frequency 60-80 2 81-101 12 102-122 3 123-143 11 144-164 3 Step 5 of 5: Determine the number of scores between 59.5 and 101.5.

14 see question (2+12=14)

Consider the following frequency table representing the scores on a test. Scores on a Test Class Frequency 60-80 2 81-101 12 102-122 3 123-143 11 144-164 3 Step 3 of 5: Determine the class width of each class.

21 see question 30

You are going to play mini golf. A ball machine that contains 23 green golf balls, 25 red golf balls, 21 blue golf balls, and 17 yellow golf balls, randomly gives you your ball. What is the probability that you end up with a blue golf ball? Express your answer as a simplified fraction or a decimal rounded to four decimal places.

21/86

You need to have a password with 5 letters followed by 4 even digits between 0 and 9, inclusive. If the characters and digits cannot be used more than once, how many choices do you have for your password?

26x25x24x23x22x5x4x3x2 see question 60

User passwords for a certain computer network consist of 3 letters followed by 2 numbers. How many different passwords are possible? Repetition is allowed.

26x26x26x10x10=

Describe the complement of the given event. 71% of a person's credit card purchases are seventy dollars or more.

29%

Construct a histogram that represents the following data regarding the selling prices of houses sold in 2006 for a particular neighborhood. Prices of Houses Class Frequency 277642-287641 4 287642-297641 3 297642-307641 5 307642-317641 3 317642-327641 5 Step 1 of 5: Find the lower class boundary for the third class.

297641.5 see question 30

Out of 300 applicants for a job, 145 are male and 51 are male and have a graduate degree. Step 1 of 2: What is the probability that a randomly chosen applicant has a graduate degree, given that they are male? Express your answer as a fraction or a decimal rounded to four decimal places.

51/145 or .3517

If an outcome is favored over another, we call this .

Bias

Identify the sampling technique used for the following study. In order to influence the outcome of the study, a political strategist hand-selects the first ten members to arrive to be studied in depth.

Convenience Sampling

Classify the following scenario as a meta-analysis or a case study. Fifteen fish caught in a bay are measured to determine the overall health of the fish in the bay.

Case Study

Identify the sampling technique used for the following study. A school administrator interviews each member from each of the ten randomly chosen freshmen dormitories at universities across the country.

Cluster Sampling

Consider the following sets of sample data: A: 20,165, 20,873, 20,480, 22,074, 22,228, 20,612, 20,154, 20,052, 21,762, 21,479, 22,023, 20,010, 21,871, 21,779 B: 4.73, 4.56, 4.30, 3.28, 4.20, 4.78, 4.35, 3.57, 4.50, 4.79, 4.04 Step 2 of 2: Which of the above sets of sample data has the larger spread?

Data set B

Determine if the following events are independent. Going to the gym. Losing weight.

Dependent

Clara is looking into investing a portion of her recent bonus into the stock market. While researching different companies, she discovers the following standard deviations of one year of daily stock closing prices. Masterful Pocketwatches: Standard deviation of stock prices =$9.73 Handy Prosthetics: Standard deviation of stock prices =$1.12 Based on the data and assuming these trends continue, which company would give Clara a stable long-term investment?

Handy Prosthetics; the smaller standard deviation indicates that Handy Prosthetics has less variability in its closing prices than Masterful Pocketwatches.

Determine whether the statement describes a descriptive or inferential statistic. A survey of 3159 people revealed that 73% are self-conscious about their weight; therefore it can be assumed that 73% of the U.S. population are self-conscious about their weight.

Inferential Statistic

Find the class width for this histogram

Looking at the histogram, we can see that the class boundaries for the first class are $75,000.50 and $125,000.50. Therefore, the class width for this histogram is: $125,000.50−$75,000.50=$50,000.

Find the lower class limit of the second class. (Problem with histogram)

Looking at the histogram, we can see that the class boundaries for the second class are $125,000.50 and $175,000.50. Therefore, the smallest amount that belongs to the second class is $125,001. Correct Answer: $125,001

For the following type of data set, would you be more interested in looking at the mean, median, or mode? State your reasoning. The salary of first-year teachers at a local elementary school

Mean, The salaries of teachers are quantitative data with no outliers.

Decide if the following statement about graphs is true or false. Graphs can often bring out hidden relationships and general trends.

True