Question

7.3.11-T Question Help A clinical trial was conducted to test the effectiveness of a drug used for treating insomnia in older subjects. After treatment with the drug, 27 subjects had a mean wake time of 90.9 min and a standard deviation of 41.1 min. Assume that the 27 sample values appear to be from a normally distributed population and construct a 95% 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.)

Answer 1

n=27 = 90.9 S-41.1 S² 1689.21 (n-1) 52 2 (n-1) s 2 in-1) X2 Blna) 1-2- 0.95 2. 0.05 o 0.025 26 X 1689.2) 26 X 1689.21 28.975,26 X2 0.025 126 0.975,26 = 41.9 (by a table) Xoors 126 13.2 26* 1689.21 26 X 1689.4 213.8 ul.9 I LoL 56.41 Please like 32.38