Answer
Factor A: since we could not reject the null hypothesis, it is not necessary to perform the Tukey’s test.
Factor B: The results are ambiguous. We can conclude that $µ_{Level~2}\neµ_{Level~3}$, but we could not conclude that $µ_{Level~1}\neµ_{Level~2}$ or that $µ_{Level~1}\neµ_{Level~3}$.
There is at least one Type II error (when we do not reject $H_0$ when we should have rejected).
Work Step by Step
With the results from item (a) still available:
Select Stat -> ANOVA -> General Linear Model -> Comparisons
In Response select C3. In Type of comparison select Pairwise. In Method select Tukey. In Choose terms for comparisons select Factor B.
Click OK.
