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(c) Suppose the following regression model is fitted to a dataset: Y = Bo + BIX1 + B2X2 + B3XIX2+c. If X2is fixed at a

(c) Suppose the following regression model is fitted to a dataset: Y = Bo + BIX1 + B2X2 + B3XIX2+c. If X2is fixed at a value z, then how much does the mean response change with one unit change in X1

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