A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with thedrug 28 subjects had a mean wake time of 97.4 min and a standard deviation of 40.4 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 iseffective?

Find the confidence interval estimate.

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min<<

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min

(Round to two decimal places asneeded.)

Does the result indicate whether the treatment iseffective?

A.

Yes, the confidence interval indicates that the treatment is effective because the interval contains 0 minutes.

B.

Yes, the confidence interval indicates that the treatment is not effective because the interval does not contain 0 minutes.

C.

Yes, the confidence interval indicates that the treatment is not effective because the interval does not contain 97.4 minutes.

D.

Yes, the confidence interval indicates that the treatment is effective because the interval does not contain 97.4 minutes.

E.

No, the confidence interval does not indicate whether the treatment is effective.

F.

Yes, the confidence interval indicates that the treatment is not effective because the interval contains 0 minutes.

G.

Yes, the confidence interval indicates that the treatment is effective because the interval does not contain 0 minutes.