A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Beforetreatment, 18 subjects had a mean wake time of 101.0 min. Aftertreatment, the 18 subjects had a mean wake time of 91.5 min and a standard deviation of 22.4 min. Assume that the 18 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 101.0 min before thetreatment? Does the drug appear to beeffective?

Construct the 99% confidence interval estimate of the mean wake time for a population with the treatment.

What does the result suggest about the mean wake time of 101.0 min before thetreatment? Does the drug appear to beeffective?

The confidence interval the mean wake time of 101.0 min before thetreatment, so the means before and after the treatment This result suggests that the drug treatment a significant effect.