Question

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 103.0 min. After treatment, the 13 subjects had a mean wake time of 80.9 min and a standard deviation of 20.4 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 103.0 min before the treatment? Does the drug appear to be effective? Construct the 90 % confidence interval estimate of the mean wake time for a population with the treatment. nothing minless thanmuless than nothing min (Round to one decimal place as needed.) What does the result suggest about the mean wake time of 103.0 min before the treatment? Does the drug appear to be effective? The confidence interval ▼ includes does not include the mean wake time of 103.0 min before the treatment, so the means before and after the treatment ▼ could be the same. are different. This result suggests that the drug treatment ▼ has does not have a significant effect.

Answer 1

90 % confidence interval estimate of the mean wake time =70.8 ; 91.0

The confidence interval does not include the mean wake time of 103.0 min before the treatment, so the means before and after the treatment are different. This result suggests that the drug treatment has a significant effect.