[题目]利用独立性检验来考虑两个分类变量X和Y是否有关系时.通过查阅临界值表来确定推断“X与Y有关系的可信度.如果k＞5.024.那么就推断“X和Y有关系 .这种推断犯错误的概率不超过( )A．0.25 B．0.75 C．0.025 D．0.975 题目和参考答案——青夏教育精英家教网—

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【题目】利用独立性检验来考虑两个分类变量X和Y是否有关系时，通过查阅临界值表来确定推断“X与Y有关系”的可信度，如果k＞5.024，那么就推断“X和Y有关系”，这种推断犯错误的概率不超过（）

A．0.25 B．0.75

C．0.025 D．0.975

【答案】C

【解析】∵P（k＞5.024）＝0.025，故在犯错误的概率不超过0.025的条件下，认为“X和Y有关系”．

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