Expound on the fact example: the interrelated degree of two marks of yes or on, sample estimate in the condition of two mark of yes or no.

以实际的例子阐述：两个是非标志的相关程度；两个是非标志相关条件下的抽样估计。

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Explain the conception of the mark of yes or no and average number and its involution difference.

细说是非标志的概念、平均数及其方差。

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Explain the conception of the mark of yes or no and average number and its involution difference.

细说是非标志的概念、平均数及其方差。

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