PSYC 2017 Study Guide - Quasi, The Control Group, Causal Inference
Document Summary
Cause and effect must covary (there must be a relationship between the iv and. Cause must precede effect (changes in the iv must precede changes in the dv) The participants are randomly assigned to the experimental and control groups: quasi design: nonequivalent comparison group design. The control group reveals a small positive change from pretest and posttest, but the experimental group increases at a faster rate. Selection-maturation effect: refers to the fact that one of the two groups of participants was selected in such a way that its participants were growing or developing at a faster rate than the participants in the other group. Selection-history effect: an extraneous event occurring between pretest and posttest influences participants in one group differently than participants in another group. Selection-instrumentation effect: participants" score sin one groups are affected by the process of measurement different than participants in another group.
