A clinical trial was conducted to test the effectiveness of

Last updated: 10/31/2023

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 91 8 min and a standard deviation of 42 8 min Assume that the 13 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 www min o 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 contains 0 minutes OB No the confidence interval does not indicate whether the treatment is effective OC Yes the confidence interval indicates that the treatment is not effective because the interval does not contain 91 8 minutes OD Yes the confidence interval indicates that the treatment is effective because the interval does not contain 0 minutes OE Yes the confidence interval indicates that the treatment is effective because the interval contains 0 minutes OF Yes the confidence interval indicates that the treatment is effective because the interval does not contain 91 8 minutes G Yes the confidence interval indicates that the treatment is not effective because the interval does not contain 0 minutes