A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects . Before treatment , 14 subjects had a mean wake time of 102. 0 min . After treatment , the 14 subjects had a mean wake time of $0 . 5 min and a standard deviation of 23.9 min . Assume that the 14 sample values appear to be from a normally distributed population and construct a 90%/}| 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 102. 0' min before the treatment ? Does the drug appear to be effective ?\\ Construct the 90% confidence interval estimate of the mean wake time for a population with the treatment . _ min