A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the​ drug, 20 subjects had a mean wake time of 95.3 min and a standard deviation of 40.9 min. Assume that the 20 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?       Question content area bottom Part 1 Find the confidence interval estimate.   enter your response here min<σ

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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,
20
subjects had a mean wake time of
95.3
min and a standard deviation of
40.9
min. Assume that the
20
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?
 
 
 

Question content area bottom

Part 1
Find the confidence interval estimate.
 
enter your response here
min<σ<enter your response here
min
​(Round to two decimal places as​ needed.)
 
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