Mathematics
Undergraduate
Resolved
どなたか教えてください。
ある調査では一日 2回以上歯ブラシする人は, 239 人中 165人が虫歯であった. 一方,
一日 1回以下しか歯ブラシしない人は, 464人中 416人が虫歯であった. ブラッシング回数に有意差
はあるか、危険率 1%で検定せよ.
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