Question: Risk of Injury. The risk of injury is higher for males compared to females (57% versus 43%). A hospital emergency room supervisor wishes to determine if the proportions of injuries to males in his hospital are the same for each of four months. He surveys 100 injuries treated in his ER for each month. The results are shown here. At a = 0.05, can he reject the claim that the proportions of injuries for males are equal for each of the four months?