在重置抽样时，样本均值的标准差为总体标准差σ的（　　）。

A、1／n

B、<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/dec6ab31-2318-4cba-851f-e036171f5356.jpg" width="37" height="24" />

C、<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/c3e8b28f-1f23-44ec-aa90-07bd8b5246b7.jpg" width="40" height="39" />

D、<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/087f2694-a6ca-4949-990f-b9163bb38c3a.jpg" width="36" height="33" />

B、<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/dec6ab31-2318-4cba-851f-e036171f5356.jpg" width="37" height="24">

C、<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/c3e8b28f-1f23-44ec-aa90-07bd8b5246b7.jpg" width="40" height="39">

D、<img src="https://static.tiw.cn//s/tiw/p3/UpLoadImage/2013-05-07/087f2694-a6ca-4949-990f-b9163bb38c3a.jpg" width="36" height="33">