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Paired Data Sets and Scatterplots


Observed values of statistical variables sometimes are in the form of paired numbers. Such sets are called bivariate data sets. Each paired number is called a paired item. To plot a bivariate data set, we apply the same technique usually used in graphing algebraic equations.

In this method, we designate one axis to the first members of the paired items and the other axis to the second members. The points produced by this method are called scatterplot.