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 92.6 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 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? Find the confidence  interval  estimate

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