– Have you seen ______ workers pass by?

--- Yes, I’ve seen ____ them.

A．woman; hundreds of

B．women; hundreds of

C．woman; two hundred of

D．women; hundred of

假设检验是为了（）。

A.研究样本指标是否相同

B.研究总体指标是否相同

C.排除主观因紊对抽样的影响

D.排除抽样误差的影响

E.研究总体分布是否相同