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Unformatted text preview: group. Control is best match we can do. Post Pre Time 180 150 120 90 60 30 Mean Packa Quasi-Experiment Nonequivalent Control Group Store 1 (Control) Store 2 (Experimental) Note. Pretest means are different. Look for what would be an interaction in a true experiment. Quasi-experiment (4) • No treatment effect Post Pre Time 180 150 120 90 60 30 Quasi-experiment Store 1 (Control) Store 2 (Experimental) Means for both groups increase similarly. 3 Review • How do you show an effect with a single-subject design? • How do you show an effect with a quasi-experiment? • What is the major design difference between a true experiment and a quasi experiment? • What is the difference in what you can infer between the true experiment and the quasi-experiment?...
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- Fall '08
- true experiment, nonequivalent control group