Question 1182688: A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before treatment, 14 subjects had a mean wake time of 103.0 min. After treatment, the 14 subjects had a mean wake time of 94.8 min and a standard deviation of 22.1 min. Assume that the 14 sample values appear to be from a normally distributed population and construct a 99% 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 103.0 min before the treatment? Does the drug appear to be effective?
Construct the 99% confidence interval estimate of the mean wake time for a population with the treatment.
__ min < μ < __ min
(Round to one decimal place as needed.)
Answer by Boreal(15235)   (Show Source):
You can put this solution on YOUR website! 99% CI half-interval is t(0.995, df=13)*s/sart(n)
=3.012*22.1/sqrt(14)
=17.79, or 17.8
so the 99%CI in min is (77.0, 112.6)
Because 103 is in the interval, fail to reject Ho.
Yes, 77.0.
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