A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the​ drug, 13 subjects had a mean wake time of 94.2 min and a standard deviation of 40.6 min. Assume that the 13 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.

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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,
13
subjects had a mean wake time of
94.2
min and a standard deviation of
40.6
min. Assume that the
13
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.
 
nothing
min<σ<nothing
min
​(Round to two decimal places as​ needed.)
Does the result indicate whether the treatment is​ effective?
 
 
A.
​Yes, the confidence interval indicates that the treatment is not effective because the interval does not contain
94.2
minutes.
 
B.
​No, the confidence interval does not indicate whether the treatment is effective.
 
C.
​Yes, the confidence interval indicates that the treatment is not effective because the interval does not contain 0 minutes.
 
D.
​Yes, the confidence interval indicates that the treatment is not effective because the interval contains 0 minutes.
 
E.
​Yes, the confidence interval indicates that the treatment is effective because the interval does not contain 0 minutes.
 
F.
​Yes, the confidence interval indicates that the treatment is effective because the interval contains 0 minutes.
 
G.
​Yes, the confidence interval indicates that the treatment is effective because the interval does not contain
94.2
minutes.
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