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下列关于抽样误差的说法，正确的有A.
抽样误差是参数值和统计值之间的差异
B.
抽样误差是衡量样本代表性大小的标准
C.
无论是概率抽样还是非概率抽样，都能够比较精确地估算出抽样误差
D.
一般来说，抽样误差主要取决于总体的异质性程度和样本规模
E.
抽样误差是人为产生的，可以避免或消除
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