A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before treatment, 18 subjects had a mean wake time of 102.0 min. After treatment, the 18 subjects had a mean wake time of 95.7 min and a standard deviation of 20.3 min. Assume that the 18 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? Construct the 95% confidence interval estimate of the mean wake time for a population with the treatment.
nothing min
nothing min
(Round to one decimal place as needed.)
What does the result suggest about the mean wake time of 102.0 min before the treatment? Does the drug appear to be effective?
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
▼
are different.
could be the same.
This result suggests that the drug treatment
▼
does not have
has
a significant effect.