下面是一个2×2的列联表  y1y2总计 x1a2173 x222527 合计54b100 则表中a

下面是一个2×2的列联表

 

y1

y2

总计

x1

a

21

73

x2

2

25

27

合计

54

b

100

则表中ab的值依次为(  )

A44,54                                                       B52,46 

C54,46                                                       D52,54

答案

B

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