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Math · Statistics And Probability
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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, 17 subjects had a mean wake time of 97.5 min and a standard deviation of 43.2 min. Assume that the 17 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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