A variable such as Z, whose value is Z = X₁X₂ is added to a general linear model in order to account for potential effects of two variables X₁ and X₂ acting together. This type of effect is A)impossible to occur B)called interaction C)called multicollinearity effect D)called transformation effect

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This variable Z is an interaction term, which accounts for the combined effect of X₁ and X₂. Therefore, the correct answer is B) called interaction.

A Variable Such as Z, Whose Value Is Z =