Question

A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before​ treatment,14 subjects had a mean wake time of 101.0 min. After​ treatment, the

14 subjects had a mean wake time of 96.3 min and a standard deviation of 24.1 min. Assume that the 14 sample values appear to be from a normally distributed population and construct

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 101.0 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.

nothing

minless than<muμless than<nothing

min

​(Round to one decimal place as​ needed.)

What does the result suggest about the mean wake time of

101.0

min before the​ treatment? Does the drug appear to be​ effective?The confidence interval

▼

includes

does not include

the mean wake time of

101.0

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.

Answer 1

Here

sample mean

sample standard deviation

and sample size

a 90% confidence interval estimate of the mean wake time for a population with the treatment

So,

a 90% confidence interval estimate of the mean wake time for a population with the treatment =  

2. The confidence interval includes the mean wake time of 101.0 min before the​ treatment, so the means before and after the treatment could be the same. This result suggests that the drug treatment does not have a significant effect.