Question

A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before​ treatment,

21 subjects had a mean wake time of

101.0 min. After​ treatment, the 21 subjects had a mean wake time of 97.4 min and a standard deviation of

23.9 min. Assume that the

21

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

101.0 min before the​ treatment? Does the drug appear to be​ effective?

Answer 1