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

16

subjects had a mean wake time of

101.0

min. After treatment, the

16

subjects had a mean wake time of

78.1

min and a standard deviation of

20.6

min. Assume that the

16

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

90%

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?

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Part 1

Construct the

90%

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