A.40 B.60 C.100 D.50
A.X-1.96SE﹤Xt≤X+1.96SE B.X-1.96SE≥Xt C.X+1.96SE≤Xt D.X-1.96SE≌Xt≌X+1.96SE
A.[0,0.7) B.[0.7,0.85) C.[0.85,1.00] D.1.00