PSY 310 Chapter Notes - Chapter 10: Random Assignment, Design Of Experiments, Repeated Measures Design
11 Mar 2019
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Designing, conducting, analyzing, and interpreting experiments with two groups. Experimental design - the general plan for selecting participants, assigning participants to experimental conditions, controlling extraneous variables, and gathering data. Principle of parsimony - the belief that explanations of phenomena and events should remain simple until the simple explanations are no longer valid. Independent variable (iv) - a stimulus or aspect of the environment that the experimenter directly manipulates to determine its influences on behavior. Dependent variable (dv) - a response or behavior that the experimenter measures. Changes in the dv should be caused by manipulation of the iv. Extraneous variables - uncontrolled variables that may unintentionally influence the dependent variable and thus invalidate an experiment. Levels - differing amounts or types of an iv used in an experiment (also known as treatment conditions) Experimental group - in a two-group design, the group of participants that receives the iv.
