A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Beforetreatment, 23 subjects had a mean wake time of 105.0 min. Aftertreatment, the 23 subjects had a mean wake time of 78.6 min and a standard deviation of 23.3 min. Assume that the 23 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 wake time of 105.0 min before thetreatment? Does the drug appear to beeffective?

Construct the 99% confidence interval estimate of the mean wake time for a population with the treatment.

min<< min

(Round to one decimal place asneeded.)