Question

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

25

subjects had a mean wake time of

103.0

min. After​ treatment, the

25

subjects had a mean wake time of

75.9

min and a standard deviation of

24.8

min. Assume that the

25

sample values appear to be from a normally distributed population and construct a

99​%

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

103.0

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

Answer 1