PSY 310 Chapter Notes - Chapter 11: Dependent And Independent Variables, Design Of Experiments, Repeated Measures Design
13 Apr 2019
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Document Summary
Experimental design - the general plan for selecting participants, assigning participants to experimental conditions, controlling extraneous variables, and gathering data. Multiple-group design - used for experimental situations in which you have one independent variable that has 3 or more levels/conditions. May or may not use a control group. If there is a control group, there are at least 2 experimental groups in addition. Correlated groups - groups of participants formed by creating matched sets, using natural pairs, or using repeated measures. Using a multiple-correlated-groups design reduces your degrees of freedom, making it more difficult to reject the null hypothesis, but also reducing the error variability. Confounded experiment - an experiment in which an extraneous variable varies systematically with the iv, which makes drawing a cause-and-effect relation impossible. Matching variable - a potential extraneous variable on which we measure our research participants and from which we form sets of participants who are equal on the variable.
