PSYC 2018H Lecture Notes - Lecture 6: Repeated Measures Design, Random Assignment, Rare Disease
29 Nov 2015
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An experimental design in which different groups of participants serve in the different conditions of the study (g&g, 2013, p. 493) . An experimental design in which the same participant"s serve in each of the conditions of the study; also called a repeated measures design (goodwin"&"goodwin,"2013,"p. 493). Examples of when we have to use them: subject variables (example: males and females, young and old, anxious vs. non-anxious, manipulated variables. Disadvantages: need larger numbers than within subject designs. Can"t have the same person witness the laptop stolen twice. Example: comparing recall for semantically related words versus unrelated words. The most common procedure for creating equivalent groups in a between- subjects design; each individual volunteering for the study has an equal probability of being assigned to any of the groups. (goodwin & goodwin, But what about smaller samples: example: you have the sat scores for 12 students: If study is very expensive less likely to use random assignment.
