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A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 22 subjects had a mean wake time of 94.6 min and a standard deviation of 41.5 min. Assume that the 22 sample values appear to be from a normally distributed population and construct a 90% 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 Find the confidence interval estimate mín < σ < | |mín (Round to two decimal places as needed.)

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2 MA:90 32 674 2. 2 x(441L 2. 2. > 36167 , 25 /.にく301/1.25 32-67 591 07 013:

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