7.4) 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 100.0 min. After​ treatment, the...

7.4)

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

subjects had a mean wake time of

min. After​ treatment, the

subjects had a mean wake time of

min and a standard deviation of

min. Assume that the

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

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

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

Construct the

confidence interval estimate of the mean wake time for a population with the treatment.

min