In a first-order model with two predictors, $x _ { 1 }$ and $x _ { 2 }$ , an interaction term may be used when the relationship between the dependent variable $y$ and the predictor variables is linear.

Question

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An interaction term is used when the effect of one predictor on the dependent variable depends on the level of another predictor, indicating a non-linear relationship between the predictors and the dependent variable.

In a First-Order Model with Two Predictors x1x _ { 1 }x1​

In a First-Order Model with Two Predictors $x _ { 1 }$