A First Course in Probability (10th Edition)
10th Edition
ISBN: 9780134753119
Author: Sheldon Ross
Publisher: PEARSON
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A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 28 subjects had a
Transcribed Image Text:5. A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 28 subjects
had a mean wake time of 90.6 min and a standard deviation of 40.2 min. Assume that the 28 sample values appear to be from a normally distributed
population and construct a 90% confidence interval estimate of the standard deviation of the wake times for a population with the drug treatments.
Does the result indicate whether the treatment is effective?
Find the confidence interval estimate.
| min<o<[
(Round to two decimal places as needed.)
Does the result indicate whether the treatment is effective?
min
O A. Yes, the confidence interval indicates that the treatment is effective because the interval does not contain 90.6 minutes.
O B. Yes, the confidence interval indicates that the treatment is effective because the interval does not contain 0 minutes.
O C. Yes, the confidence interval indicates that the treatment is not effective because the interval does not contain 90.6 minutes.
O D. Yes, the confidence interval indicates that the treatment is not effective because the interval contains 0 minutes.
OE. Yes, the confidence interval indicates that the treatment is not effective because the interval does not contain 0 minutes.
OF. No, the confidence interval does not indicate whether the treatment is effective.
G. Yes, the confidence interval indicates that the treatment is effective because the interval contains 0 minutes.
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