PSYCO212 Lecture Notes - Lecture 23: Internal Validity, Statistical Power, Random Assignment

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Between-subjects design: an experimental design in which different groups of participants are exposed to different levels of the independent variable. Systematic variability: the situation that occurs when the levels of a variable coincide in some predictable way with experimental group membership, creating a potential confound. Unsystematic variability: the levels of a variable occurring independently of experimental group membership, contributing to variability within groups. Within-subjects design: a study design in which each participant is presented with all levels of the independent variable. Post test only design: an experiment with an independent-groups design in which participants are tested on the dependent only once. Pre-test/ post-test: an experiment with an independent-groups design in which participants are tested on the key dependent variable twice, once before and once after exposure to the independent variable. Mueller and dweck"s study: telling participants either that they must have worked hard on the problems or that they were just smart, and see how that effects their performance.

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