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 102.0 min. After treatment, the 15 subjects had a mean wake time of 80.4 min and a standard deviation of 20.4 min. Assume that the 15 sample values appear to be from a normally distributed population and construct a 95% 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 102.0 min before the treatment? Does the drug appear to be effective?

A) Construct the 95% confidence interval estimate of the mean wake time for a population with the treatment.

? min << ? min(Round to one decimal place as needed.)

B) The confidence interval

includes

does not include

the mean wake time of 102.0 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.