Question: 21. Refer to Problem 19. Fit the model Y = 0 + 1X1 + 2X2 + 3X3 + 12X1X2 + 13X1X3 + 23X2X3 +
21. Refer to Problem 19. Fit the model Y = β0 + β1X1 + β2X2 + β3X3 + β12X1X2 + β13X1X3 + β23X2X3 + ε
and compute the Mallows’ Cp, PRESS and R2 pred statistics. Compare these statistics with those computed in Problem 20 (b).
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