A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the​ drug, 29 subjects had a mean wake time of 96.6 min and a standard deviation of 44.6 min. Assume that the 29 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? a. Find the confidence interval estimate.   min less than sigma less than  min ​(Round to two decimal places as​ needed.)

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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, 29 subjects had a mean wake time of 96.6 min and a standard deviation of 44.6 min. Assume that the 29 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?

a. Find the confidence interval estimate.

 
min less than sigma less than  min
​(Round to two decimal places as​ needed.)
Expert Solution
Step 1

Given

n=29, s=44.6=sample standard deviations 

Level of significance ɑ=0.10

 

 

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