PSYC 201W Chapter Notes - Chapter 10: Pattern Matching, Causal Inference, Dependent And Independent Variables
4 Apr 2018
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Designs: principles used to rule out rival explanations in quasi-experimental designs. Identification and study of plausible threats to internal validity: Non-equivalent comparison group design: non-equivalent comparison group design: a quasi-experimental designs in which the results obtained for non-equivalents experimental and control groups are compared, lacks random assignment, recommended when a better design cannot be used. Control group: the pretest component is very important because they tell us how well the groups compared initially. Causal inference from the non-equivalent comparison group design: how to strengthen internal validity of a quasi-experimental design, participants cannot be allowed to self-select their treatment condition, reduce pretest differences among groups. O1 o2 o3 o4 o5: why is this better than the one-group pretest-posttest design, numerous measures of the dependent variable before and after the treatment. 4-6 show a significant difference from pre- to post-test measures. 2-3: although the results fluctuate, the pattern remains the same from pre- to post-test measures.
