question41

standard deviation of 47 seconds. He recognizes this is only a point estimate of the variation in completion times and so wants to report both a 90% and a 95% confidence interval estimate for the population variance. 11-41. A medical research group is investigating what differences might exist between two pain-killing drugs, Azerlieve and Zynumbic. The researchers have already established there is no difference between the two drugs in terms of the average amount of time required before they take effect. However, they are also interested in knowing if there is any difference between the variability of time until pain relief occurs. A random sample of 24 patients using Azerlieve and 32 patients using Zynumbic yielded the following results: Azerlieve Zynumbic nA = 24 nz = 32 SA - 37.5 seconds Sz = 41.3 seconds Based on these sample data, can the researchers conclude a difference exists between the two drugs? 11-42. The Littleton Corporation manufactures high-speed electronic cables and focuses on products for the specialty electronics and data networking markets, including connectivity. One of its products is a fiber- optic cable. It is designed to have an overall diameter of 0.440 inch. A standard deviation greater than 0.05 inch