Test 1

The prices (in dollars) of 12 electric smooth top ranges are listed below. Find the range for the given sample data. 865 1010 655 565 1465 1110 710 765 820 1310 555 1065

$910

Determine which level of measurement is appropriate. A sample of children's balls are classified from softest to hardest.

Ordinal

Determine which of the four levels of measurement is most appropriate. Level of satisfaction of survey respondents.

Ordinal

Determine which of the four levels of measurement is most appropriate. Students' grades of A, B,or C, on a test.

Ordinal

Smoking and the episodes of lung cancer have a high correlation, but it does not prove ________

causation

The linear ________ coefficient denoted by r measures the ________ of the linear association between two variables.

correlation; strength

x0.510.020.140.290.340.80.470.71y0.310.46-0.120.34-0.050.80.350.47

know you see 2 in the negative so chart it that way

The four levels of measurement that are commonly used for classifying data are ratio, ________,________, and ________.

nominal; ordinal; interval

In a cross-sectional study, data are ________.

observed, measured, and collected at one point of time

A ________ is the complete collection of all measurements or data collected, whereas, a ________ isa subcollection of members selected from the complete collection.

population; sample

The good design of experiments includes blinding, ________, and ________.

replication; randomization

The two key parts of a regression equation involve the ________ and the y-________

slope; intercept

A nurse measured the blood pressure of each person who visited her clinic. Following is arelative-frequency histogram for the systolic blood pressure readings for those people agedbetween 25 and 40 years. The blood pressure readings (in mm Hg) were given to the nearest wholenumber. What class width was used to construct the relative frequency distribution?

10 years

The histogram below represents the number of television sets per household for a sample of U.S.households. What is the sample size?

100 households

The ages of the 45 members of a track and field team are listed below. Which of these choicesdisplay the correct stemplot? 211842353221442538481419232228323427311716413722243332212630222732302018172115263631401625

14 515 6 6 7 7 8 8 920 1 1 1 1 2 2 2 3 425 5 6 6 7 7 830 0 1 1 2 2 2 2 3 435 6 7 840 1 2 448

On a test, 74% of the questions are answered correctly. If 111 questions are correct, how manyquestions are on the test?

150 questions

If your score on your next statistics test is converted to a z score, which of these z scores would you prefer?

2.00

A student earned grades of B, B, A, C, and D. Those courses had these corresponding numbers of credit hours: 4, 5, 1, 5, 4. The grading system assigns quality points to letter grades as follows: A =4, B = 3, C = 2, D = 1, and F = 0. Compute the grade point average (GPA) and round the result to two decimal places.

2.37

The frequency distribution below summarizes the home sale prices in the city of Summerhill for themonth of June. Determine the class midpoint (in thousand $) for the class 235.0-265.9.

250.45

The number of vehicles passing through a bank drive -up line during each 15-minute period was recorded. The results are shown below. Find the median number of vehicles going through the line in a 15-minute period. 25 27 25 28 28 25 30 27 35 31 31 29 24 31 25 20 15 27 27 27

27 vehicles

The frequency distribution below summarizes employee years of service for Alpha Corporation.Find the class midpoint for class 1-5.

3.0 years Add 1 and 5 you get six divide by 2 you get 3

The following data show the number of laps run by each participant in a marathon. 46 65 55 43 51 48 57 30 43 49 32 56

30 243 3 6 8 951 5 6 765

A gardener has 75 clients, 45% of whom are businesses. Find the number of business clients.

34 clients

A nurse measured the blood pressure of each person who visited her clinic. Following is a relative-frequency histogram for the systolic blood pressure readings for those people aged between 25 and 40 years. The blood pressure readings were given to the nearest whole number.Approximately what percentage of the people aged 25-40 had a systolic blood pressure reading between 110 and 119 mm Hg inclusive?

35%

20)Analysis of the data from 25 mothers indicates that an infant's birth weight (g), y, can be estimatedby a mother's weight (kg), x, using the regression equation y = 31x + 1501. If a mother's weight is 70kg, the infant's birth weight can be estimated as ________ g.

3671

The following frequency distribution represents the scores on a math test. Find the class midpoint of scores for the interval 40-59.

49.5

The following frequency distribution displays the scores on a math test. Find the class boundaries of scores interval 40-59.

49.5, 59.5

Find the standard deviation for the given sample data. Round your answer to one more decimal place than the original data. 18 18 18 9 15 5 10 5 15

5.4

Listed below are the amounts of time (in months) that the employees of a restaurant have been working at the restaurant. Find the mean for the given sample data. Round your answer to one more decimal place than the original data values. 1 5 6 8 11 14 17 46 61 90 99 126 143 167

56.7 months

Find the standard deviation for the given sample data. Round your answer to one more decimalplace than is present in the original data. 22.6 16.1 36.1 36.0 23.8 20.3

8.35

A student earned grades of 84, 78, 84, and 72 on her four regular tests. She earned a grade of 78 on the final exam and 86 on her class projects. Her combined homework grade was 87. The four regular tests count for 40% of the course grade, the final exam counts for 30%, the project counts for 10%, and homework counts for 20%. What is her weighted mean grade? Round to one decimal place.

81.2

When finding percentiles, if the locator L is not a whole number, one procedure is to interpolate so that a locator of 23.75, for example, leads to a value that is 3/4 of the way between the 23rd and 24th scores. Use this method of interpolation to find P75 for the set of test scores below. 51 54 64 68 72 74 76 83 94 94 99

85.75

The Kappa Iota Sigma Fraternity polled its members on the weekend party theme. The vote was asfollows: six for toga, four for hayride, eight for luau, and two for masquerade. Display the votecount in a Pareto chart.

A tallest/biggest to smallest

The customer service department of a phone company is experimenting with two different systems.On Monday they try the first system which is based on an automated menu system. On Tuesdaythey try the second system in which each caller is immediately connected with a live agent. Aquality control manager selects a sample of seven calls each day. He records the time for eachcustomer to have his or her question answered. The times (in minutes) are listed below. Find thecoefficient of variation for each of the two sets of data, then compare the variation. Round results toone decimal place. Automated Menu: 11.7 7.4 3.9 2.9 9.2 6.3 5.5 Live agent: 6.2 2.9 4.4 4.1 3.4 5.2 3.7

Automated Menu: 45.4% Live agent: 26.3%There is substantially more variation in the times for the automated menu system.

Identify which type of sampling is used. A tax auditor selects every 1000th income tax return that is received.

Convenience

What type of data values are quantitative and the number of values is finite or countable?

Discrete

Attendance records at a school show the number of days each student was absent during the year.The days absent for each student were as follows.

List them on the line correctly

There are many potential pitfalls that can cause problems when analyzing data. Which of these choices are not classified as a potential pitfall?

Measured data

A marketing firm does a survey to find out how many people use a product. Of the one hundred people contacted, fifteen said they use the product. Identify the type of study used.

Observational study

The scatterplot below displays the amount of nitrous oxide (NO) explained by the amount ofcarbon monoxide (CO) emissions in million metric tons over a ten year period in the United States.Select the choice that best describes any relationship between the variables.

Overall, there is no noticeable relationship between NO and CO.

Determine whether the given value is a statistic or a parameter. After taking the first exam, 15 of the students dropped the class.

Parameter

Determine whether the given value is a statistic or a parameter. Thirty percent of all dog ownerspoop scoop after their dog.

Parameter

Identify which type of sampling is used.A pollster uses a computer to generate 500 random numbers, then interviews the voters corresponding to those numbers.

Random

Researchers collect data by interviewing athletes who have won Olympic gold medals from 1992 to 2016. Identify the type of study.

Retrospective

Identify which type of sampling is used. The name of each contestant is written on a separate card,the cards are placed in a bag, and three names are picked from the bag.

Simple Random

A tax auditor selects every 1000th income tax return that is received. Identify which of these typesof sampling is used.

Systematic