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Part 1

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

14

subjects had a mean wake time of

101.0

min. After treatment, the

14

subjects had a mean wake time of

80.2

min and a standard deviation of

23.4

min. Assume that the

14

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

95%

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

101.0

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

Construct the

95%

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