A、<img width="79" height="23" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/560823e2-10b7-4675-a60f-037403f600f4.png" />
B、<img width="87" height="23" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/50596554-9359-42d9-baef-dee18ed26841.png" />
C、<img width="104" height="37" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/1064cc32-028b-48a7-9fcd-faf8233ddb4c.png" />
D、<img width="132" height="60" src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/c6aec4ce-f9ea-412d-b245-036d79b41a34.png" />
查看答案
为来自总体N（0，1）的简单随机样本，
为样本均值，
为样本方差，则（ ）。