Suppose That the Sample Regression Line of a First Order $= 8 + 2 x _ { 1 } + 3 x _ { 2 }$

Multiple Choice

Suppose that the sample regression line of a first order model is $= 8 + 2 x _ { 1 } + 3 x _ { 2 }$ . If we examine the relationship between y and $x _ { 1 }$ for four different values of $x _ { 2 }$ , we observe that the:

A) effect of x $1$ on y remains the same no matter what the value of x $2$ .
B) effect of x $1$ on y remains the same no matter what the value of x $1$ .
C) only difference in the four equations produced is the coefficient of x $2$ .
D) None of these choices are correct.