In the Model $Y _ { i } = \beta _ { 0 } + \beta _ { 1 } X _ { 1 } + \beta _ { 2 } X _ { 2 } + \beta _ { 3 } \left( X _ { 1 } \times X _ { 2 } \right) + u _ { i }$

question 27

Multiple Choice

In the model $Y _ { i } = \beta _ { 0 } + \beta _ { 1 } X _ { 1 } + \beta _ { 2 } X _ { 2 } + \beta _ { 3 } \left( X _ { 1 } \times X _ { 2 } \right) + u _ { i }$ the expected effect $\frac { \Delta Y } { \Delta X _ { 1 } }$ is

• A) \(\beta _ { 1 } + \beta _ { 3 } X _ { 2 }\)
• B) \(\beta _ { 1 } .\)
• C) \(\beta _ { 1 } + \beta _ { 3 }\)
• D) \(\beta _ { 1 } + \beta _ { 3 } X _ { 1 }\)

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