14.47.* Show that using a cross-product term to model interaction assumes that the slope of the relationship

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14.47.* Show that using a cross-product term to model interaction assumes that the slope of the relationship between y and x1 changes linearly as x2 changes. How would you suggest modeling interaction if, instead, the slope of the linear relationship between y and x1 first increases as x2 changes from low to moderate values and then decreases as x2 changes from moderate to high values?

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