A. 当μ已知时，样本函数 （X i-μ） 2/n
B. 当μ已知时，样本函数 （X i-μ） 2/（n-1）
C. 当μ未知时，样本函数 （X i-μ） 2/n
D. 当μ未知时，样本函数 （X i-μ） 2 /（n-1）
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