A clinical trial was conducted to test the effectiveness of a drug for the treatment of insomnia in elderly subjects Before treatment, 13 subjects had a moan awake time of 101.0 min After treatment, the 13 subjects had a mean awake time of 97.7 min and a standard deviation of 202 min. Assume that the 13 sample values appear to be from a normally distributed population and construct a 905% confidence interval estimate of the mean wake time for a drug-treated population. What does the result suggest about the average waking time of 101.0 min before treatment? Does the drug seem effective constructions 90% confidence interval estimates of the mean wake time for a population with the treatment
