Question: Fill in the blank. If there is __________ between (x_{1}) and (x_{2}) in a least-squares regression model, we would build a model of the form

Fill in the blank. If there is __________ between $x_{1}$ and $x_{2}$ in a least-squares regression model, we would build a model of the form $\hat{y}_{i}=\beta_{0}+\beta_{1} x_{1 i}+\beta_{2} x_{2 i}+\beta_{3} x_{1 i} x_{2 i}+\varepsilon_{i}$.

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