Inevalating the economic plausibility of a regression model, the analyst is determining Ot s tine for chimin-changas. I the staritical sigiticance of the relationship of the independent variable, X with the dependent variable, Y. 0 whether the chosen independent variable, X, is a viable, sensible predictor of the dependent variable, Y, using judgment and understanaing of cause-and-effect relationships. O the degree to which the regression line fits the actual observations. O the comriation of veriable costs to fixed costs in the total cost line determination