Question

A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before​ treatment, 21 subjects had a mean wake time of 105.0 min. After​ treatment, the 21 subjects had a mean wake time of 84.6 min and a standard deviation of 22.6 min. Assume that the 21 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 105.0 min before the​ treatment? Does the drug appear to be​ effective?

Answer 1

(a)

(b) As the both limits are less than 105, the result suggest that the mean wake time is less than 105.0 min after the​ treatment.

(c) The drug appears to be effective since the result suggest that the mean wake time is less than 105.0 min after the​ treatment.