Continuation of Problem 2.40. An article in Nature

(1972, pp. 225–226) reported on the levels of monoamine oxidase in blood platelets for a sample of 43 schizophrenic patients resulting in y1 = 2.69 and s1 = 2.30 while for a sample of 45 normal patients the results were y2 = 6.35 and s2 = 4.03. The units are nm/mg protein/h. Use the results of the previous problem to test the claim that the mean monoamine oxidase level for normal patients is at least twice the mean level for schizophrenic patients. Assume that the sample sizes are large enough to use the sample standard deviations as the true parameter values.