Question: Another way to answer the question of interaction between the independent variables in Problem 8.13 is to define a dummy variable that indicates whether an

Another way to answer the question of interaction between the independent variables in Problem 8.13 is to define a dummy variable that indicates whether an observation is above the median weight, and an equivalent variable for height. Relate FEV1 for the fathers to these dummy variables, including an interaction term. Test the hypothesis that there is no interaction.

Compare your results with those of Problem 8.13.

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