Refer to Exercise 16.15.
a. Use a computer program to fit the model of part (b) of Exercise 16.15. Use α = .05.
b. Test for parallelism of the lines.
c. Assuming that the lines are parallel, test for differences in treatment means adjusted for the covariate. Use a 5 .05.
In exercise

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Pretreatment Posttreatment Age Block Gender (vears) A F 20 48 F 2040 43 F 40 44 M 20 42 M 20-40 37 M 40 41 31 28 21 17 19 18 17 15 19 31 35 21 24 18 26 21 18 29 34 24 24 26