【多选题】【消耗次数：1】
抽样估计中的抽样误差（）
①
是不可避免要产生的
②
是可以通过改进调查方法来消除的
③
是可以事先计算出来的
④
只能在调查结束之后才能计算
⑤
其大小是可以控制的
参考答案：
复制
纠错
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