a和d是否真的被忽略? YsNo合计 YsNo合计 Yes 10 15 Yes 51 15 No 6 2+ No 6 33 2+ 计 n n 36 n 105 p1=(0+15)36=0.694 p=(51+15)/105=0629 0+6)/36=0444 P2=(51+6)105=0543 P1-P2=0.250 P1-p2=0.086 SE B1-2/3621-92/36 SE(p1-P2)=而V21-92/105 0.1203 =0.0428 95%C:0251.96×0.1203 95%C/:0.086平1.96×0.0428 即:0.014~0486 即:0.002~0.170a和d是否真的被忽略？ Yes No 合计 Yes 10 15 n1+ No 6 5 n2+ 合计 n+1 n+2 36 Yes No 合计 Yes 51 15 n1+ No 6 33 n2+ 合计 n+1 n+2 105 ( ) ( ) ( ) : 0.014 ~ 0.486 95% : 0.25 1.96 0.1203 0.1203 21 9 36 0.250 10 6 36 0.444 10 15 36 0.694 2 36 1 1 2 1 2 2 1 即  = − = − − = = + = = + = CI  SE p p p p p p ( ) ( ) ( ) : 0.002 ~ 0.170 95% : 0.086 1.96 0.0428 0.0428 21 9 105 0.086 51 6 105 0.543 51 15 105 0.629 2 105 1 1 2 1 2 2 1 即  = − = − − = = + = = + = CI  SE p p p p p p