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Unformatted text preview: observed was a net gain of zero. People often try to conclude things on the basis of this design, but it cannot be used to make causal inferences. A quasi experimental design: The nonequivalent control group design. In this design, we have pre and post measures for two groups. However, the groups are not randomly assigned. The control group is the best we can do to match the experimental group. Post Pre Time 180 150 120 90 60 30 Mean Packa Quasi-Experiment Nonequivalent Control Group Store 1 (Control) Store 2 (Experimental) We expect the means to be different at pretest. We look for difference in groups in the pattern of pre- and post-test scores. Post Pre Time 180 150 120 90 60 30 Quasi-experiment Store 1 (Control) Store 2 (Experimental)...
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- Fall '08