A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before treatment,

15

subjects had a mean wake time of 100.0 min. After treatment, the15

subjects had a mean wake time of 76.9

min and a standard deviation of 24.8

min. Assume that the 15

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

100.0

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.

________min<<________min

(Round to one decimal place as needed.)

Part 2 What does the result suggest about the mean wake time of

100.0 min before the treatment? Does the drug appear to be effective? The confidence interval

does not include? or includes? the mean wake time of 100.0

min before the treatment, so the means before and after the treatment are different? or are the same?.

Does this result suggest that the drug treatment

has an effect? or does not have an effect?.