4 Perform a backward stepwise regression on the model with interactions (Model 2) similarly to the forward stepwise regression. Based on the output of this stepwise regression analysis, a The rst two interaction terms discarded from the model are those with the age factors. I) The rst two interaction terms discarded from the model are those with the edu- cation factors. c Backward stepwise regression and forward stepwise regression select the same variables. (1 Backward stepwise regression selects one additional interaction term in addition to the selected interaction terms by forward stepwise regression