To predict college GPA from high school GPA, we have to create a regression equation and use that to plot what is called a regression line. A regression line reflects our best guess as to what score on the Y variable (college GPA) would be predicted by a score on the X variable (high school GPA). For all the data you see in Table 16.1, the regression line is drawn so that it minimizes the distance between itself and each of the points on the predicted (Y′) variable.
