Question: Consider Exercise 15.3 once again. Three-factor interactions are often not significant, and even if they are, they are difficult to interpret. The interaction ABD appears

Consider Exercise 15.3 once again. Three-factor interactions are often not significant, and even if they are, they are difficult to interpret. The interaction ABD appears to be important. To gain some sense of interpretation, show two AD 1i 2i 1 2 12 1 2 12 interaction plots, one for B = –1 and the other for B = +1. From the appearance of these, give an interpretation of the ABD interaction.

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