【多选题】【消耗次数：1】
影响合理的必要抽样数目的因素主要有：
①
调查时点
②
调查项目
③
总体各单位之间的差异程度
④
不同的抽样方式和方法
⑤
允许误差的大小
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【简答题】
简述影响抽样误差大小的因素
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