A multiple regression includes two regressors: (Y_{i}=beta_{0}+beta_{1} X_{1 i}+beta_{2} X_{2 i}+u_{i}). What is the expected change in

Question:

A multiple regression includes two regressors: $Y_{i}=\beta_{0}+\beta_{1} X_{1 i}+\beta_{2} X_{2 i}+u_{i}$. What is the expected change in $Y$ if $X_{1}$ increases by 3 units and $X_{2}$ is unchanged? What is the expected change in $Y$ if $X_{2}$ decreases by 5 units and $X_{1}$ is unchanged? What is the expected change in $Y$ if $X_{1}$ increases by 3 units and $X_{2}$ decreases by 5 units?

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