Consider the sample regression equation yˆ = 12 + 3x1 ? 5x2 + 7x3 ? 2x4. When x1 increases by 1 unit and x2 increases by 2 units, while x3 and x4 remain unchanged, what change would you expect in the predicted y? Multiple Choice Decrease by 7 Decrease by 4 No change in predicted y Decrease by 2.