[商管] [統計]-變異數定義
才剛開始學統計
想請問變異數的定義
母體變異數的公式是1/NΣ[X-u]^2
想問的是N/1的用途
如果要得知分散程度
不是用Σ[X-u]^2 就可以了嗎
除以n的用意是?
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