S1 OCR Line of Regression

This depends on which is understood (based on the context of the problem) to be the dependent variable (with the other being interpreted as the independent variable).

If y is the dependent variable ( and x the independent variable), then the regression line of y on x is relevant.


If x is the dependent variable ( and y the independent variable), then the regression line of x on y is relevant.


Hope this clarifies, Peace.