Question: 2. In a typical simple linear regression model, explore the relationship between the expected value of change in the response variable y and the

2. In a typical simple linear regression model, explore the relationship between the expected value of change in the response variable y and the value of the regressor x changed by 20 or 40 units. Describe the condition or assumption, if any, to meet for such exploration. 3. In a multiple linear regression model y =B + Bx + Bx + where x1 and x2 are two regressors. Explore the relationship between the expected value of change in the response variable y and the value of the regressor x1 changed by 20 or 40 units. Describe the condition or assumption, if any, to meet for such exploration. 4. In a multiple linear regression model, y =B + Bx + BX + BXX + where x1 and x2 are two regressors which have an additional joint effect on the response y via the coefficient B3. Explore the relationship between the expected value of change in the response variable y and the value of the regressor x1 changed by 20 or 40 units. Please describe the condition or assumption, if any, to meet for such exploration.

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