Refer to Exercise 16 7 a Test the hypothesis that the relationships
Refer to Exercise 16.7.
a. Test the hypothesis that the relationships between increase in sales and average monthly sales have equal slopes for the three promotions at the α = .05 level.
b. Does there appear to be a difference in the increase in sales for the three promotions?
c. Are the necessary conditions for conducting the tests of hypotheses in parts (a) and (b) satisfied with this data set?
In exercise
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