A multiple regression includes two regressors: Upper Y Subscript i equals beta 0 plus beta 1 Upper X Subscript 1 i Baseline plus beta 2 Upper X Subscript 2 i Baseline plus u Subscript i Use the tool palette to the right to answer the following questions. What is the expected change in Y if Upper X 1 increases by 8 units and Upper X 2 is unchanged? The expected change in Y if Upper X 1 increases by 8 units and Upper X 2 is unchanged is nothing. (Properly format your expression using the tools in the palette. Hover over tools to see keyboard shortcuts. E. g., a subscript can be created with the _ character.)