求翻译：通过抽样的方法，利用样本研究总体的特性时，由于存在抽样误差，样本中两个变量的相关系数不为0并不能说明总体中这两个变量相关系数不是0，因此必须经过检验。是什么意思？

By the sampling method, using the characteristics of the overall study sample, the sampling error because of the sample correlation coefficient between two variables is not zero and can not indicate the overall correlation coefficient of these two variables is not 0, it must be tested.

Samples from a sample of research methods, the use of the whole sampling errors due to the existence, identity, and samples of the two variables is not 0 correlation coefficient does not indicate the two variables in overall correlation coefficient is not 0, and therefore must be tested.

When through sampling method, use sample research overall characteristic, because has the sampling error, in the sample two variable correlation coefficients are not 0 cannot show in the overall these two variable correlation coefficient is not 0, therefore must pass through the examination.

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