Refer to Exercise 13.69.
a. Give the implied regression line of pulse- rate difference on height and weight for a smoker who did not run in place and who has engaged in little physical activity.
b. Consider the following two statements:
There is multicollinearity between the smoke variable and the physical activity dummy variables.
There is an interaction effect between the smoke variable and the physical ­activity dummy variables.
Is there any difference between these two statements? Explain the relationships that would exist in the data set if each of these two statements was correct.
In exercise

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