Alternative Approaches. Specialized Designs. 1. Single Subject Designs. A is baseline. B is treatment. Add and remove treatment to find effect. Common designs: A-B, A-B-A, A-B-A-B. Interrupted Time Series. Effects of 9/11 on volunteering. 2. Quasi-experimental Designs.
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A is baseline. B is treatment. Add and remove treatment to find effect. Common designs: A-B, A-B-A, A-B-A-B
Effects of 9/11 on volunteering
No causal conclusion is possible here.
Note. Pretest means are different. Look for what would be an interaction in a true experiment.
Means for both groups increase similarly.