Question: It is desired to relate E(y) to a quantitative variable x1 and a qualitative variable at three levels. a. Write a first-order model. b. Write
It is desired to relate E(y) to a quantitative variable x1 and a qualitative variable at three levels.
a. Write a first-order model.
b. Write a model that will graph as three different second-order curves, one for each level of the qualitative variable.
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