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This is done so that the relationship (if any) between the variables is easily seen. [4] For example, bivariate data on a scatter plot could be used to study the relationship between stride length and length of legs. In a bivariate correlation, outliers can be incredibly problematic when they involve both extreme scores on both variables.
Regression is a statistical technique used to help investigate how variation in one or more variables predicts or explains variation in another variable.