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Calculating Correlation by Katherine Williams

Author: Sophia

Terms to Know

Correlation: The strength and direction of a linear association between two quantitative variables.
Correlation coefficient (r): The numerical value between -1 and +1 that measures the correlation between two quantitative variables.

Formulas to Know

Correlation: $r space equals space fraction numerator 1 over denominator n minus 1 end fraction sum from blank to blank of z subscript x times z subscript y space equals space fraction numerator 1 over denominator n minus 1 end fraction sum from blank to blank of open parentheses fraction numerator x minus top enclose x over denominator s subscript x end fraction close parentheses open parentheses fraction numerator y minus top enclose y over denominator s subscript y end fraction close parentheses$