A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. before treatment 21 subjects had a mean wake up time of 101.0. after treatment the 21 subjects had a mean wake time of 92.4 min and a standard deviation of 23.1 min. assume that the 21 sample values appear to be from a normally distributed population and construct a 99% confidence interval estimate of the mean wake time for a population with drug treatments. what does the result suggest about the mean time of 101.0 min before the treatment
