In Exercises 5–20, assume that the two samples are independent simple random samples selected from
10. Second-Hand Smoke Data Set 12 “Passive and Active Smoke” in Appendix B includes cotinine levels measured in a group of nonsmokers exposed to tobacco smoke (n = 40,
a. Use a 0.05 significance level to test the claim that nonsmokers exposed to tobacco smoke have a higher
b. Construct the confidence interval appropriate for the hypothesis test in part (a).
c. What do you conclude about the effects of second-hand smoke?

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Chapter 9 Solutions
ELEMENTARY STATS. 18 WEEK ACCESS CODE
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