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A multiple regression includes two regressors: Yi=0+1X1i+2X2i+ui Use the tool palette to the right to answer the following questions. What is the expected change in Y if X1 increases by 7 units and X2 is unchanged? The expected change in Y if X1 increases by 7 units and X2 is unchanged is (Properly format your expression using the fools in the paletfe. Hover over tools to se keyboard shorteuts. Eg, a subscript can be created with the _ character.) What is the expected change in Y it X2 decreases by 9 units and X1 is unchanged? The expected change in Y if X2 decreases by 9 units and X1 is unchanged is (Properly format your expression using the tools in the paiette.) What it the expected change in Y it X1 increases by 8 units and X2 decreases by 2 units? The expected change in Y if Xf increases by 8 units and X2 decreases by 2 units is (Properly format your expression using the tools in the paietf