Unbiasedness (不偏性). E( X )=μ. E( X )=E[(X1+X2+…+Xn )/n]. =(1/n)[E(X1)+E(X2)+...+E(Xn)]. =(1/n)[ μ+μ+…+μ]= μ. 2. Consistency (趨近性;一致性).
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