A fitted multiple regression equation is Y=12+3x1-5x2+7x3+2x4. when x1 increases 2 units and x2 increases 2 units as well, while x3 and x4 remain unchanged, what change would you expect in your estimate of Y?
A) decrease by 4
B) increase by 2
C) no change in y
D) decrease by 2
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