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χ2增大，P值减小 χ2减小，P值也减小 χ2增大，P值也增大 χ2减小，P值增大 视数据不同而异
χ12 =χ22 χ12 ＞χ22 χ12 ＜χ22 χ12 比χ22准确 χ22 比χ12准确
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χ2增大，P值减小 χ2减小，P值也减小 χ2增大，P值也增大 χ2减小，P值增大 视数据不同而异
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