Review Questions
1. What is a reversal design? Why is an ABAB design superior to an ABA design?
2. What is meant by baseline in a single-case design?
3. What is a multiple baseline design? Why is it used? Distinguish between multiple baseline designs across subjects, across behaviors, and across situations.
4. Why might a researcher use a quasi-experimental design rather than a true experimental design?
5. Why does the use of a control group eliminate the problems associated with the one-group pretest- posttest design?
6. Describe the threats to internal validity discussed in the text: history, maturation, testing, instrument decay, regression toward the mean, and selection differences.
7. Describe the nonequivalent control group pretest-posttest design. Why is this a quasi-experimental design rather than a true experiment?
8. Describe the interrupted time series and the control series designs. What are the strengths of the control series design as compared with the interrupted time series design?
9. Distinguish between longitudinal, cross-sectional, and sequential methods.
10. What is a cohort effect?
