A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before? treatment, 16 subjects had a mean wake time of 104.0 min. After? treatment, the 16 subjects had a mean wake time of 81.1 min and a standard deviation of 24.4 min. Assume that the 16 sample values appear to be from a normally distributed population and construct a 95?% 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 104.0 min before the? treatment? Does the drug appear to be? effective?

Construct the 95?% confidence interval estimate of the mean wake time for a population with the treatment.

Construct the 95?% confidence interval estimate of the mean wake time for a population with the treatment.

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