刘同学2024-07-22 21:08:21
The best approach for creating a stratified random sample of a population involves:A.drawing an equal number of simple random samples from each subpopulation.B.selecting every kth member of the population until the desired sample size is reached.C.drawing simple random samples from each subpopulation in sizes proportional to the relative size of each subpopulation.老师AB为什么不对
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葛王璐2024-08-06 20:44:28
同学你好,分层随机抽样是将总体根据一定的规则分成若干个层级,在每个层级中随机抽取一定数量的样本,而由于每一个层级本身可能就有数量的差异,所以样本的数量要和总体的情况越相近越好,即每个层级里的样本大小需要与这个层级在总体中的大小成正比,所以A、B其实都是抽取等量的两本
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