A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Beforetreatment,21 subjects had a mean wake time of102.0 min. Aftertreatment, the21 subjects had a mean wake time of95.2 min and a standard deviation of

22.5 min. Assume that the21 sample values appear to be from a normally distributed population and construct a95% confidence interval estimate of the mean wake time for a population with drug treatments. What does the result suggest about the mean wake time of102.0 min before thetreatment? Does the drug appear to beeffective?

Construct the95% confidence interval estimate of the mean wake time for a population with the treatment.

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(Round to one decimal place asneeded.)