Clinical trials connected to test effectiveness of a drug used for treating insomnia and older subjects. After treatment with the drug 28 subjects had a mean wake time of 92.5 minutes and a standard deviation of 40.1 minutes. Assume that the 28 sample values appear to be from a normally distributed population and construct a 98% confidence interval estimate of the standard deviation of the wake time for the population with the drug treatment. Does the results indicate whether the treatment is effective