[問題] 獨立性質
如果X ⊥ Y => E(XY) = E(X)E(Y)
因為不會打符號...
所以令樣本平均數=C 樣本變異數 = D
請問為什麼E(CD) = E(C)E(D)
樣本平均數跟樣本變異數不是應該不獨立嗎?
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