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【单选题】
对15个猪肝给予某种处理,在处理前后各采一次肝外表的涂抹标本进行细菌培养,结果如下.欲比较处理前后的带菌情况有无差别,:A.
2×2表的卡方检验
B.
2×2列联表的卡方检验
C.
3×3表的卡方检验
D.
3×3列联表的卡方检验
E.
四格表的确切概率法
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D.
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