Create the following five transformed variables in the worksheet (use Calc > Calculator): X2, X2, X2, X?, and X . Why would we consider adding quadratic terms like this to the model? O To allow the linear association between expected Y and each quantitative predictor to differ 1. ( between regions. 2. O To retain hierarchy among the predictors. To allow for interaction between the quantitative predictors. O To allow the association between expected Y and each quantitative predictor to be nonlinear. 4 . st