A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before treatment, 14
subjects had a mean wake time of 102.0 min. After treatment, the 14 subjects had a mean wake time of
97.4 min and a standard deviation of 23.2 min. Assume that the 14 sample values appear to be from a normally distributed population and construct a
90% confidence interval estimate of the mean wake time for a population with drug treatments. What does the result suggest about the mean wake time of
102.0 min before the treatment? Does the drug appear to be effective?
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