Patients with myocardial infarctions were assigned to one of four thrombolytic (clot-dissolving) treatments and then followed to determine 30-day mortality. The data are summarized in the table below:

	Survived	Died
Control Group: Standard Care	887	117
Group 1: t-PA and IV Heparin	967	79
Group 2: Streptokinase and IV Heparin	901	85
Group 3: t-PA, streptokinase, and IV Heparin	912	59

1. By hand, perform the appropriate statistical test to determine if there is a difference in the survival among the four populations.