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A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in...

A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before​ treatment,13 subjects had a mean wake time of 100.0 min. After​ treatment, the13 subjects had a mean wake time of 93.5 min and a standard deviation of 20.7 min. Assume that the13 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 100.0 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.

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