A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before treatment, 17 subjects had a mean wake time of 103.0 min. After treatment, the 17 subjects had a mean wake time of 99.4

min and a standard deviation of 21.5 min. Assume that the 17 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.

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min<

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

are different.

could be the same.

This result suggests that the drug treatment

has

does not have

an effect.