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分层随机抽样(给出各层数)求总方差的公式的一种表达形式及证明

Floor 3 啊啊是谁都对 5/23/25 22:41
这个我应该在专门的概率统计教材(入门科普读物)中看到过……现在高中都这么复杂了?
star 7/3/25 8:48
不是高中教的啦,我自己发现的

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