A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before treatment, subjects had a mean wake time of min. After treatment, the subjects had a mean wake time of min and a standard deviation of min. Assume that the sample values appear to be from a normally distributed population and construct a % 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 min before the treatment? does the drug appear to be effective?.
