A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Beforetreatment, 25 subjects had a mean wake time of 104.0 min. Aftertreatment, the 25 subjects had a mean wake time of 97.6 min and a standard deviation of 22.2 min. Assume that the 25 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 thetreatment? Does the drug appear to beeffective?

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