A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Beforetreatment, 19

19 subjects had a mean wake time of 105.0

105.0 min. Aftertreatment, the 19

19 subjects had a mean wake time of 95.8

95.8 min and a standard deviation of 21.6

21.6 min. Assume that the 19

19 sample values appear to be from a normally distributed population and construct a 99

99% 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 105.0

105.0 min before thetreatment? Does the drug appear to beeffective?