A clinical trial was conducted to test the effectiveness of adrug for treating insomnia in older subjects. Before? treatment, 20subjects had a mean wake time of 105.0 min. After? treatment, the20 subjects had a mean wake time of 98.5 min and a standarddeviation of 21.52 min. Assume that the 20 sample values appear tobe from a normally distributed population and construct a 95?%confidence interval estimate of the mean wake time for a populationwith drug treatments. What does the result suggest about the meanwake time of 105.0 min before the? treatment? Does the drug appearto be? effective? Construct the 95?% confidence interval estimateof the mean wake time for a population with the treatment.
