Suppose That the Sample Regression Line of the First-Order Model

Multiple Choice

Suppose that the sample regression line of the first-order model is .If we examine the relationship between y and x₁ for four different values of x₂,we observe that the:

A) only difference in the four equations produced is the coefficient of x₂.
B) effect of x₁ on y remains the same no matter what the value of x₂.
C) effect of x₁ on y remains the same no matter what the value of x₁.
D) Cannot answer this question without more information.