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

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Basic Math

A clinical trial was conducted to test the effectiveness of adrug used for treating insomnia in older subjects. After treatmentwith the​ drug, 28 subjects had a mean wake time of 96.9 min and astandard deviation of 42.3 min. Assume that the 28 sample valuesappear to be from a normally distributed population and construct a98​% confidence interval estimate of the standard deviation of thewake times for a population with the drug treatments. Does theresult indicate whether the treatment is​ effective? Find theconfidence interval estimate. nothing minless thansigmaless thannothing min ​(Round to two decimal places as​ needed.)

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Solution Given that 969s 423n 28Degrees of freedom df n 1 28 1    See Answer
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