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分散と偏差の違いはなんですか

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数Iなら
偏差=平均からデータの値を引いた値
分散=偏差の二乗の和の平均

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_偏差は、標本の偏り。集合の要素の話し。
_分散は、標本の散らばり具合。集合全体の話し。

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