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

39

patients walked on a treadmill for six minutes every day. After six months, the mean distance walked in six minutes was

325

meters, with a standard deviation of

71

meters. For a control group of

56

patients who did not walk on a treadmill, the mean distance was

356

meters with a standard deviation of

99

meters. Can you conclude that the mean distance walked for patients using a treadmill is less than the mean for the controls? Let

1

denote the mean distance walked for patients who used a treadmill. Use the

=0.05

level of significance and the TI-84 Plus calculator.