A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before​ treatment, 13 subjects had a mean wake time of 104.0 min. After​ treatment, the 13 subjects had a mean wake time of 82.1

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,

13

subjects had a mean wake time of

104.0

min. After​ treatment, the

13

subjects had a mean wake time of

82.1

min and a standard deviation of

23.6

min. Assume that the

13

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 drug treatments. What does the result suggest about the mean wake time of

104.0

min before the​ treatment? Does the drug appear to be​ effective?

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