A、当n充分大时,样本均值<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/6d0d8f3b-b987-445e-a2fd-b471061d1f45.jpg" width="17" height="23" />的分布近似服从正态分布
B、只有当n<30时,样本均值<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/6d0d8f3b-b987-445e-a2fd-b471061d1f45.jpg" width="17" height="23" />的分布近似服从正态分布
C、样本均值<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/6d0d8f3b-b987-445e-a2fd-b471061d1f45.jpg" width="17" height="23" />的分布与n无关
D、无论n多大,样本均值<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/6d0d8f3b-b987-445e-a2fd-b471061d1f45.jpg" width="17" height="23" />的分布都为非正态分布
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