A clinical trial was conducted to test the effectiveness of the drug zopiclone for treating insomnia in older subjects. Before treatment with zopiclone, 21 subjects had a mean wake time of 102.0 minutes. After treatment with zopiclone, the 21 subjects had a mean wake time of 80.7 minutes and s standard deviation of 24.9 minutes. Assume that the 21 sample values appear to be from a normally distributed population and construct a 90% confidence interval estimate of the mean wake time for a population with zopiclone treatments. What does the result suggest about the mean wake time of 102.0minutes before the treatment? Does zopiclone appear to be effective?

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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A clinical trial was conducted to test the effectiveness of the drug zopiclone for treating insomnia in older subjects. Before treatment with zopiclone, 21 subjects had a mean wake time of 102.0 minutes. After treatment with zopiclone, the 21 subjects had a mean wake time of 80.7 minutes and s standard deviation of 24.9 minutes. Assume that the 21 sample values appear to be from a normally distributed population and construct a 90% confidence interval estimate of the mean wake time for a population with zopiclone treatments. What does the result suggest about the mean wake time of 102.0minutes before the treatment? Does zopiclone appear to be effective?
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