NO.PZ2015120601000009
问题如下：
The correlation coefficient that indicates the weakest linear relationship between variables is:
选项：
A. −0.75.
B. −0.22.
C. 0.35.
解释：
B is correct.
Correlations near positive 1.00 exhibit strong positive linearity; correlations near negative 1.00 exhibit strong negative linearity. Correlations of zero indicate no linear relation between variables. The closer the correlation is to zero, the weaker is the linear relationship.
线性关系，相关系数，协方差，三者之间（或者还有更多）的性质结论是什么？记串了
