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A clinical trial was conducted to test the effectiveness of a drug used for treating...

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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, 28 subjects had a mean wake time of 90.2 min and a standard deviation of 42.1 min. Assume that the 28sample 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 thetreatment is effective?Find the confidence interval estimate.min

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