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A medical study compares two treatments for kidney stones. The data below shows the success rate of the treatment in general, and it also shows the distinction between small and large stones. small stones large stones both (total) Treatment A 81 / 87 193% 192 / 263 73% 273 / 350 78% Treatment B 234 / 270 87% 55 / 80 69% 289 / 350 83% Notice Wonder small stones have higher Success rate. Treatment B has higher Success rate