Exam 3: Describing, Exploring, and Comparing Data

If your score on your next statistics test is converted to a z score, which of these z scores would you prefer? Explain your answer. $- 2.50 , - 1.50,0,1.00,2.25$

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

Scores on the SAT test have a mean of 1518 and a standard deviation of 325. Scores on the ACT test have a mean of 21.1 and a standard deviation of 4.8. Which of the following Choices is not true?

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

Which do you think has less variation: the IQ scores of students in your statistics class or the IQ scores of a simple random sample taken from the general population? Why?

If the standard deviation for a set of data is 0, which of the following must be true?

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

Describe any similarities or differences in the two distributions represented by the following boxplots. Assume the two boxplots have the same scale.

A comparison is made between summer electric bills of those who have central air and those who have window units. Find the mean and median for each of the two samples, then compare the two sets of results. May June July Aug Sept Central \ 32 \ 64 \ 80 \ 90 \ 65 Window \ 15 \ 84 \ 99 \ 120 \ 40

Scores on a test have a mean of 66 and a standard deviation of 9. Michelle has a score of 57. Convert Michelle's score to a z score.

The test scores of 40 students are listed below. Find P56. 30 35 43 44 47 48 54 55 56 57 59 62 63 65 66 68 69 69 71 72 72 73 74 76 77 77 78 79 80 81 81 82 83 85 89 92 93 94 97 98

Last year, nine employees of an electronics company retired. Their ages (in years)at retirement are listed below. Find the mode(s)for the given sample data. 51 61 62 57 50 67 68 58 53

Human body temperatures have a mean of 98.20° F and a standard deviation of 0.62° F? Sally's temperature can be described by z = -1.5. What is her temperature? Round your Answer to the nearest hundredth.

The heights of the adults in one town have a mean of 67.1 inches and a standard deviation of 3.5 inches. What can you conclude from Chebyshev's theorem about the percentage of adults In the town whose heights are between 60.1 and 74.1 inches?

A company had 80 employees whose salaries are summarized in the frequency distribution below. Find the standard deviation. Salary (dollars) Employees 5,001-10,000 19 10,001-15,000 14 15,001-20,000 12 20,001-25,000 16 25,001-30,000 19

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

Which of the following is not a property of variance?

Listed below are the systolic blood pressures (in mm Hg)for a sample of men aged 20-29 years and for a sample of men aged 60-69 years. Men aged 20-29: 117 122 129 118 131 123 Men aged 60-69: 130 153 141 125 164 139 Find the coefficient of variation for each of the two sets of data, then compare the variation. Round results to one decimal place.

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

The local Tupperware dealers earned these commissions last month: \ 2894.21 \ 1777.15 \ 2144.77 \ 4096.37 \ 4046.29 \ 1786.37 \ 3296.69 \ 4086.27 \ 2784.22 \ 4027.79 What was the mean commission earned? Round your answer to the nearest cent.