Medical researchers conducted a study to determine whether treadmill exercise could improve the walking ability of patients suffering from claudication. which is pain caused by insufficient blood flow to the muscles of the legs. A sample of 8 patients walked on a treadmill for six minutes every day. After six months. the mean distance walked in six minutes was 348 meters, with a standard deviation of 80meters. For a control group of 7 patients who did not walk on a treadmill, the mean distance was 305 meters with a standard deviation of 93 meters. Can you conclude that the standard deviations of the distances walked differ between treatment and control? Use the a = 0.05 level of significance. Based on data in the Journal of the Anierran Wirral Association 301:165-174
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