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 94.8 min and a standard deviation of 43.9 min. Assume that the 20 sample values appear to be from a normally distributed population and construct a 95% 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. min

MATLAB: An Introduction with Applications
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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 94.8 min and a standard deviation of 43.9 min. Assume
that the 20 sample values appear to be from a normally distributed population and construct a 95% 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.
min<o<
<min
(Round to two decimal places as needed.)
Transcribed Image Text: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 94.8 min and a standard deviation of 43.9 min. Assume that the 20 sample values appear to be from a normally distributed population and construct a 95% 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. min<o< <min (Round to two decimal places as needed.)
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