A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 19 subjects had a mean wake time of 96.7 min and a standard deviation of 44.4 min. Assume that the 19 sample values appear to be from a normally distributed population and construct a 98% 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
A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 19 subjects had a mean wake time of 96.7 min and a standard deviation of 44.4 min. Assume that the 19 sample values appear to be from a normally distributed population and construct a 98% 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
MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
Section: Chapter Questions
Problem 1P
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Transcribed Image Text:A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 19 subjects had a mean wake time of 96.7 min and a standard deviation of 44.4 min. Assume that the 19 sample values
appear to be from a normally distributed population and construct a 98% 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<
min
(Round to two decimal places as needed.)
Does the result indicate whether the treatment is effective?
O A. Yes, the confidence interval indicates that the treatment is effective because the interval contains 0 minutes.
O B. No, the confidence interval does not indicate whether the treatment
effective.
O c. Yes, the confidence interval indicates that the treatment is not effective because the interval contains 0 minutes.
O D. Yes, the confidence interval indicates that the treatment is effective because the interval does not contain 0 minutes.
O E. Yes, the confidence interval indicates that the treatment is not effective because the interval does not contain 96.7 minutes.
OF.
Yes, the confidence interval indicates that the treatment is not effective because the interval does not contain 0 minutes.
O G. Yes, the confidence interval indicates that the treatment is effective because the interval does not contain 96.7 minutes.
Expert Solution
Step 1
Given data :
A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 19 subjects had a mean wake time of 96.7 min and a standard deviation of 44.4 min. Assume that the 19 sample values appear to be from a normally distributed population
sample size ,n = 19
df=n-1= 18
sample standard deviation,s= 44.4
Significance level,
α =1- 0.98 = 0.02
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