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

23

subjects had a mean wake time of

100.0

min. After treatment, the

23

subjects had a mean wake time of

91.6

min and a standard deviation of

22.4

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

100.0

min before the treatment? Does the drug appear to be effective?

Question content area bottom

Part 1

Construct the

99%

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

part 2

What does the result suggest about the mean wake time of

100.0

min before the treatment? Does the drug appear to be effective?