\(\overrightarrow{n_2}>=\frac{\sum\limits_{i=1}^n(x_{_i}-\bar{x})(y_{_i}-\bar{y})}{\sqrt{\sum\limits_{i=1}^n(x_{_i}-\bar{x})^2 \sum\limits_{i=1}^n(y_{_i}-\bar{y})^2}}\)
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