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l4. Aspirin prevents blood from clotting and so helps prevent strokes. The Second European Stroke Prevention Study asked whether adding another anticlotting drug, named dipyridamole, would be more effective for patients who had already had a stroke. Here are the data on strokes during the two years of the study. The study was a randomized comparative experiment. Number of patients Number of Strokes Aspirin Alone 1649 206 Aspirin + dipryridamole 1650 157 Is there convincing evidence at the level that adding dipryridamole helps REDUCE the risk of stroke? Just nd the t value and p value. Round t value to 2 decimals and p value to 3 decimals. Write your answer as follows: The 2 value = _____ and the p value = _________