PSYC 2300 Chapter 9: Research Methods & Statistics
Document Summary
Between-subjects design: an experiment in which different subjects are assigned to each group. Posttest only control group: an experimental design in which the dependent variable is measured after the manipulation of the independent variable. Pretest/posttest control group design: an experimental design in which the dependent variable is measured both before and after manipulation of the independent variable. Solomon four group design: a design with four groups that is a combination of the posttest only control group design and the pretest/posttest control group design. Confound: an uncontrolled extraneous variable or flaw in an experiment. Internal validity: the extent to which the results of an experiment can be attributed to the manipulation of the independent variable rather than to some confounding variable. History effect: a threat to external validity in which an outside event that is not a part of the manipulation of the experiment could be responsible for the results.
