Which of the following statements are true?

A) One way to study the fit of a model is to superimpose a graph of the best-fit function on the scatterplot of the data.

B) An effective approach to assessment of model adequacy is to compute the fitted or predicted values Y-hat and the residuals e of i=yi-y-hat, then plot various functions of these computed quantities, and examine the plots either to confirm our choice of model or for indications that the model is not appropriate.

C) Multiple regression analysis involves building models for relating the dependent variable y to two or more independent variables.

D) All of the above statements are true.

E) None of the above statements are true.