If all residuals are added together the sum would be: Select one: a. always 1.0 b. always zero c. either +1.0 or 1.0 d. always 1.0 In a regression analysis predictions always fall on the regression line. Select one: a. true b. false Composite Variances are: a. Mixed or Combined variances b. Not true variances c. Directly Actionable d. "Price" or "CM" variances