sampling - how to sample a population - cross validated
population mean测试不同sample size计算sample mean如下:sampling
samplingerrorsamplingmeanpopulationmean
如果一个样本的抽样分布(sampling distribution)平均值等于总体参数
(在这样的情况下,一定不能脱离背景直白的回答定义)94population vs
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