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分層隨機抽樣（給出各層數）求總方差的公式的一種表達形式及證明

Floor 3 啊啊是谁都对 5/23/25 22:41
這個我應該在專門的概率統計教材（入門科普讀物）中看到過……現在高中都這麼複雜了？

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