Variable 1: Caffeine

Variable 2: depression

1. Which variable did you identify as the IV and DV. (2 points)

2. Give an example of how your study (IV influencing DV) might have a nonequivalent control group posttest-only design.

3. Give an example of how your study (IV influencing DV) might have a nonequivalent control group pretest/posttest design.

4. Give an example of how your study (IV influencing DV) might have an interrupted time-series design (quasi-experimental design).

Considering the nature of a quasi-experiment, using your selected variables, how would you limit the likelihood of:

4. Selection Effect

5. History Threat

6. Attrition Threat

Reversal Designs

7. How would you apply your IV to the reversal design?

8. Why would a researcher use a multiple-baseline design?