Refer to Exercise 16.5. a. Test the hypothesis that the relationships between risk index and number of cigarettes have equal slopes for the three treatments

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Refer to Exercise 16.5.
a. Test the hypothesis that the relationships between risk index and number of cigarettes have equal slopes for the three treatments at the α = .05 level.
b. Does there appear to be a difference in the mean risk index for the three treatments?
c. Are the necessary conditions for conducting the tests of hypotheses in parts (a) and (b) satisfied with this data set?
In exercise
Refer to Exercise 16.5. a. Test the hypothesis that the relationships

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