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Chapter 9: Q. 60 (page 565)
Which of the following 95% confidence intervals would lead us to reject in favor of at the 5% significance level?
(a) (0.29, 0.38) (c) (0.27, 0.31) (e) None of these
(b) (0.19, 0.27) (d) (0.24, 0.30)
(b) (0.19,0.27)
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Attitudes The Survey of Study Habits and Attitudes (SSHA) is a psychological test that measures students鈥� attitudes toward school and study habits. Scores range from . The mean score for U.S. college students is about . A teacher suspects that
older students have better attitudes toward school. She gives the SSHA to an SRS of of the over students at her college who are at least years of age. Check the conditions for carrying out a significance test of the teacher鈥檚 suspicion.
Flu vaccine A drug company has developed a new vaccine for preventing the flu. The company claims that fewer than of adults who use its vaccine will get the flu. To test the claim, researchers give the vaccine to a random sample of adults. Of these, get the flu.
(a) Do these data provide convincing evidence to support the company's claim? Perform an appropriate test to support your answer.
(b) Which kind of mistake - a Type I error or a Type II error-could you have made in (a)? Explain.
(c) From the company's point of view, would a Type I error or Type Il error be more serious? Why?
According to the Web site sleepdeprivation.com, 85% of teens are getting less than
eight hours of sleep a night. Jannie wonders whether this result holds in her large high school. She asks an SRS of 100 students at the school how much sleep they get on a typical night. In all, 75 of the responders said less than 8 hours.
In a test of against , a random sample of size yields a test statistic of . The P-value of the test is approximately equal to
(a) .
(b) .
(c) .
(d) .
(e) .
Normal body temperature (8.2) If "normal" body temperature really is , we would expect the proportion of all healthy 18- to 40 -year-olds who have body temperatures less than this value to be . Construct and interpret a confidence interval for . What conclusion would you draw?
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