$$\text { A formula for the correlation coefficient } r \text { is }$$_____

Name: \[\text { A formula for the correlation coefficient } r \text { is }\]_____
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The Answer is

r = \frac { n ( \Sigma x y ) - ( \Sigma x ) ( \Sigma y ) } { \sqrt { \left[ n \left( \Sigma x ^ { 2 } \right) - ( \Sigma x ) ^ { 2 } \right] \left[ n \left( \Sigma y ^ { 2 } \right) - ( \Sigma y ) ^ { 2 } \right] } }

A formula for the correlation coefficient r is \text { A formula for the correlation coefficient } r \text { is } A formula for the correlation coefficient r is