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-∞＜χ2＜+∞ 0≤χ2≤+∞ χ2≤1 -∞≤χ2≤0 χ2≥1
The colour of the buildings The age of the buildings The colour of the roofs The length of the streets
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
因为有T<1，不能用χ2检验，应当用四格表的确切概率法 用非连续性校正χ2检验 肯定需连续性校正χ2检验 一定不能用χ2检验 还需要知道n的大小和最小理论频数后才能确定是否可以用χ2检验及是否需对χ2值进行校正
their sizes the machinery employed the degree of dependence on resources the kinds of crops cultivated and animals raised
and; difference as; consequence but; result or; cause
-∞<χ2<+∞ -∞<χ2<0 0≤χ2<+∞ -1<χ2<1 χ2≤1
-∞<χ2<+∞ -∞<χ2<0 0χ2<+∞ -1<χ2<1 χ2≤1
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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