A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before​ treatment, 20 subjects had a mean wake time of 100.0 min. After​ treatment, the 20 subjects had a mean wake time of 93.9 min and a standard deviation of 22.8 min. Assume that the 20 sample values appear to be from a normally distributed population and construct a 95​% confidence interval estimate of the mean wake time for a population with drug treatments. What does the result suggest about the mean wake time of 100.0 min before the​ treatment? Does the drug appear to be​ effective?

MATLAB: An Introduction with Applications
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A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before​ treatment,
20
subjects had a mean wake time of
100.0
min. After​ treatment, the
20
subjects had a mean wake time of
93.9
min and a standard deviation of
22.8
min. Assume that the
20
sample values appear to be from a normally distributed population and construct a
95​%
confidence interval estimate of the mean wake time for a population with drug treatments. What does the result suggest about the mean wake time of
100.0
min before the​ treatment? Does the drug appear to be​ effective?
 
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