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AP002_標準偏差の意味・性質

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テーマ
 標準偏差の意味・性質
メモ
 ・標準偏差とは、データ分布のばらつきを表す尺度。
・正規分布では、平均値と標準偏差(σ)、度数の間で次の関係が成り立つ。

  • 平均値±σの範囲に全体の約68%が含まれる。
  • 平均値±2σの範囲に全体の約95%が含まれる。
  • 平均値±σの範囲に全体の約99%が含まれる。
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