PSYC 203 Chapter 6: Chapter 6 - Methodological Control in Experimental Research Notes.pdf
31 May 2015
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Each level of the independent variable contains a different group of subjects. Move eyes condition- left half of the room. Fixate on the centre condition - right half of the room. Subjects in each condition must be na ve (e. g. eyewitness memory study) Advantage: subjects are na ve about the procedures used in the experiment. Differences between conditions could be due to independent variable, or due to differences within the group. Each subject --> equal chance of being placed in any group in the study. Or select which friends go in which group based on intelligence. Each block contains the 3 groups, and the order of the groups in each block are randomized. So, for the rst 12 participants in your study, they might be assigned to groups using block randomization as follows: cba bca abc acb. Use matching when: small numbers per group might cause random assignment to fail. Small numbers per group might cause random assignment to fail.
