GVPT 201 Chapter Notes - Chapter 4: Spurious Relationship, Field Experiment, Selection Bias
15 Oct 2018
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Chapter 4: research design and the logic of control. Test group: subjects who receive a treatment that the researcher believes is causally linked to the dependent variable. Control group: subjects who do not receive the treatment. Experimental design: the test group and the control group are the same in every way except for the independent variable. Controlled comparison design: allows the researcher to observe the effect of the iv on the dv while holding constant other plausible causes of the dv. Laboratory experiment: control and test group are studied in an environment made by the experimenter. Internal validity: within the conditions created artificially by the researcher the effect of the iv on the dv is isolated from other plausible explanations. External validity: the results of a study can be generalized, its findings can be applied to situations in the non artificial, natural world. Field experiment: control and test groups are studied in their normal surroundings.
