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3.2.2: Correlation Coefficient
https://stats.libretexts.org/Courses/American_River_College/STAT_300%3A_My_Introductory_Statistics_Textbook_(Mirzaagha)/03%3A_Regression_Analysis/3.02%3A_Bivariate_Data/3.2.02%3A_Correlation_Coefficient
The correlation coefficient (represented by the letter $r$ ) measures both the direction and strength of a linear relationship or association between two variables. \[r=\dfrac{S S X Y}{\sqrt{S S X \c...The correlation coefficient (represented by the letter $r$ ) measures both the direction and strength of a linear relationship or association between two variables. $r=\dfrac{S S X Y}{\sqrt{S S X \cdot S S Y}} \nonumber$ $S S X Y=\Sigma X Y-\dfrac{1}{n}(\Sigma X \cdot \Sigma Y) \nonumber$ $r=\dfrac{S S X Y}{\sqrt{S S X \cdot S S Y}}=\dfrac{-445}{\sqrt{580 \cdot 330}}=-0.9479$

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