A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before treatment, '19 subjects had a mean wake time of 104.0 min. Aftertreatment, the 19 subjects had a mean wake time of 80.2 min and a standard deviation of 20.8 min. Assume that the 19 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 the treatment? Does the drug appear to be effective? \".3 Construct the 95% condence interval estimate of the mean wake time for a population with the treatment. Dmin