A、总体均值
B、总体均值的1/n
C、总体均值的<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/dec6ab31-2318-4cba-851f-e036171f5356.jpg" width="37" height="24" />
D、总体均值的<img src="http://admintk.100xuexi.com/UpLoadImage/2013-05-07/476fdf8e-283b-4897-8cec-c770cbe207f5.jpg" width="41" height="39" />
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