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Part 1

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

11

subjects had a mean wake time of

91.1

min and a standard deviation of

41.2

min. Assume that the

11

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

98%

confidence interval estimate of the standard deviation of the wake times for a population with the drug treatments. Does the result indicate whether the treatment is effective?

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Part 1

Find the confidence interval estimate.

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min<

min

(Round to two decimal places as needed.)