Problems from textbook Chapter 4:
P2, P3, P4, P9, P10, P14, P17, P24, P25d, P26, P30, P52 (the question here might be better phrased as "what is the probability that at least one interfering pair of groups exists?")
For Chapter 4, I also suggest that you study and be able to answer Review Questions R2, R3, R4, R8, R9, R10, R11, R13, R16, R17, R18, R24, R25, R26, R27, R32, R33, R34, R36 as part of your study for the next exam.