Question: 13.32.* Suppose we use a centered variable for the covariate and express the interaction model when the categorical factor has two categories as E(y) =

13.32.* Suppose we use a centered variable for the covariate and express the interaction model when the categorical factor has two categories as E(y) = α + β1(x − μx) + β2z + β3(x − μx) × z.

Explain how to interpret β2, and explain how this differs from the interpretation for the model without a centered covariate.

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