Aclinical 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 100.0 min. After treatment, the 25 subjects had a mean wake time of 96.4 min and a standard deviation of 21 .8 min. Assume that the 25 sample values appear to be from a normally distributed population and construct a 90% condence interval estimate of the mean wake time for a population with drug treatments. What does the result suggest about the mean wake time of 100.0 min before the treatment? Does the drug appear to be effective? Construct the 90% condence interval estimate of the mean wake time for a population with the treatment. min