View answer: Testing Hypotheses. In Exercises 924, assume that a simple random sample

Chapter 8, Problem 18

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Testing Hypotheses. In Exercises 924, assume that a simple random sample has been selected and test the given claim. Unless specified by your instructor, use either the Pvalue method or the critical value method for testing hypotheses. Identify the null and alternative hypotheses, test statistic, Pvalue (or range of Pvalues), critical value(s), and state the final conclusion that addresses the original claim. Insomnia Treatment A clinical trial was conducted to test the effectiveness of the drug Zopiclone for treating insomnia in older subjects. Beforetreatment with Zopiclone, 16 subjects had a mean wake time of 102.8 min. After treatment with Zopiclone, the 16 subjects had a mean wake time of98.9 min and a standard deviation of 42.3 min (based on data from Cognitive Behavioral Therapy vs Zopiclone for Treatment of Chronic PrimaryInsomnia in Older Adults, by Siversten, et al., Journal of the American Medical Association, Vol. 295, No. 24). Assume that the 16 sample valuesappear to be from a normally distributed population, and test the claim that after treatment with Zopiclone, subjects have a mean wake time of less than102.8 min. Does Zopiclone appear to be effective?