CHAPTER 9 Cumulative Review Exercises 501 9.Waist Circumferences Listed below are waist circumferences (mm) of randomly selected U.S. Army male personnel measured in 1988 (from Data Set 2 “ANSUR I 1988”) and waist circumferences (mm) of different randomly selected U.S. Army male personnel measured in 2012 (from Data Set 3 “ANSUR II 2012”). Use a 0.05 significance level to test the claim that the differences between the pairs of data are from a population with a mean of 0 mm, indicating that there is no change. What is seriously wrong with this question? Waist (1988) 808 852 729 841 825 903 874 935 Waist (2012) 787 938 933 986 946 748 934 802 10.Variation of Hospital Times Use the sample data given in Exercise 7 “Seat Belts” and test the claim that for children hospitalized after motor vehicle crashes, the numbers of days in intensive care units for those wearing seat belts and for those not wearing seat belts have the same variation. Use a 0.05 significance level. In Exercises 1–10, based on the nature of the given data, do the following: a. Pose a key question that is relevant to the given data. b. Identify a procedure or tool from this chapter or the preceding chapters to address the key question from part (a). c. Analyze the data and state a conclusion. 1.Video Games The graph below shows percentages of people aged 18–29 who say that they play video games often or sometimes (based on data from Pew Research Center). 2.Video Games In a survey of subjects aged 18–29, subjects were asked if they play video games often or sometimes. Among 984 females, 49% answered “yes” (based on data from a Pew Research Center survey). 3.Video Games In a survey of subjects aged 18–29, subjects were asked if they play video games often or sometimes. Among 1017 males, 72% answered “yes.” Among 984 females, 49% answered “yes” (based on data from a Pew Research Center survey). 4.IQ Scores of Twins Listed below are IQ scores of twins listed in Data Set 12 “IQ and Brain Size” in Appendix B. The data are pairs of IQ scores from ten different families. First Born 96 87 101 103 127 101 93 94 97 113 Second Born 89 87 103 96 126 96 88 85 114 124 Cumulative Review Exercises
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