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简述四种不同随机抽样方法的使用条件。

问答题
2022-04-02 13:25
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正确答案
(1)简单随机抽样必须符合两条原则,其一时机会均等,其二是相互独立;
(2)分层抽样适用于总体比较大,样本容量比较小,并且这个总体的内部结构又比较复杂的情况,即总体各部分元素之间的差异要大于各部分元素之内的差异;
(3)分阶段抽样适用于总体之下各部分的个数很多,但部分之无明显差异,且样本容量较小的情况;
(4)等距抽样适用于总体很大,样本较小,总体无中间层次结构的情况。

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