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【单选题】
2*40.为研究45岁以上男性中体重指数BMI≥25者糖尿病患病率是否高于体重指数BMI<25者,某医师共调查了95550人。其中,BMI≥25者有2110人(n1),糖尿病患病人数为226人(x1);BMI<25者7440人(n2),糖尿病患病人数为310人(x2)。问BMI≥25者糖尿病患病率是否高于BMI<25者。统计学检验的检验假设(无效假设)和选择假设分别是A.
H0:P1=P2,H1:P1≠P2
B.
H0:P1=P2,H1:P1
C.
H0:π1=π2,H1:π1≠π2
D.
H0:π1=π2,H1:π1
E.
H0:π1=π2,H1:π1>π2
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A.
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