A clinical trial was conducted to test the effectiveness of a drug for treating
ID: 3368195 • Letter: A
Question
A clinical trial was conducted to test the effectiveness of a drug for treating insomnia in older subjects. Before? treatment,
20 subjects had a mean wake time of 102.0 min. After? treatment, the 20 subjects had a mean wake time of 97.7
min and a standard deviation of 22.7 min. Assume that the 20 sample values appear to be from a normally distributed population and construct a 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 102.0 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 min less than 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
?
does not include
includes
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
?
does not have
has
a significant effect.
Explanation / Answer
The statistical software output for this problem is:
One sample T summary confidence interval:
? : Mean of population
90% confidence interval results:
Hence,
90% confidence interval:
(88.9, 106.5)
Includes; Could be the same; does not have a significant effect.
Mean Sample Mean Std. Err. DF L. Limit U. Limit ? 97.7 5.0758743 19 88.923139 106.47686Related Questions
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