Question: 13.32. Suppose we use a centered variable for the covariate and express the interaction model when the categorical predictor 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 predictor has two categories as E{y) = a + piix - ixx) + P2Z + /^(x - ^)Xz.

Explain how to interpret P2. and explain how this differs from the interpretation for the model without a centered covariatc.

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