In a clinical trial to test whether a new drug (treatment) reduces the risk of stroke, the results observed in N=260 subjects is reported below. Observed Treatment Group Stroke (S = 1) No Stroke (S=0) Total Treatment (T=1) 27 108 135 Placebo (T=0) 13 112 125 Total 40 220 260 Expected Treatment Group Stroke (S = 1) No Stroke (S=0) Total Treatment (T=1) 135 Placebo (T=0) 125 Total 40 220 260 Chi-Square Calculation Treatment Group Stroke (S = 1) No Stroke (S=0) Treatment (T=1) Placebo (T=0) Chi-Square 4.595

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