11 - 9/21/11 Variable A symbol that can assume a range of...

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9/21/11 Variable A symbol that can assume a range of numerical values Some property of an organism/event that has been measured An attribute of a phenomena An aspect of a testing condition that can change or take on different characteristics with different conditions Types of Variables Independent (IV) and Dependent (DV) Subject o Age; gender (don’t want to manipulate) Continuous and Discrete/Categorical Quantitative and Qualitative Confounded o Avoid them in ones study Level of Independent Variable Minimum 2 levels o IV = Caffeine None, One, Two Diet Cokes o IV = Tutoring help None, Face-to-Face, On-line o IV = Appearance Well dressed, Shabbily dressed Levels versus number of IV’s We need at least one IV with more than one level Can also add more IV’s Factorially Combined o 2 (depressed vs. non-depressed) X 2(sing a song vs. recite a poem) o DV could be “rate how mad you are at the experimenter” What kind of variable? The effect of class size (small vs. large) discrete variable on learning (GPA)
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This note was uploaded on 12/06/2011 for the course PSYC 204 taught by Professor Payne during the Fall '08 term at Texas A&M.

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11 - 9/21/11 Variable A symbol that can assume a range of...

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