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【多选题】
对于抽样误差下列表述中正确的有（）。A.
凡进行抽样调查都会产生抽样误差
B.
抽样误差是可以控制的
C.
抽查的单位越多，抽样误差就会越小
D.
总体中个体单位之间的差异程度越大，抽样误差也越大
E.
抽样误差都是可以计算的
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A.
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