PSYCH 100B Lecture Notes - Lecture 2: Dependent And Independent Variables, Confounding, Random Assignment
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Netflix may be able to predict what you want to watch but they don"t know why. 3rd variable causing women to drink a lot of coffee and be infertile: lack of sleep, stressful work. We need an experiment where we manipulate variable of interest and cause a change in behavior. Construct validity: whether operational definition is appropriate for the variable or not. To measure this, they gave them cartoons to draw. We put rats on a drug and other rats on a placebo. Drug condition mena: 21. 2 placebo condition mean = 58. 3. Each rat only participates in a single condition. Anything in your study that is not your 2 variables, is an extraneous veriable. Anything in the universe can be an ext. variable. Extraneous variable can be present in 3 different ways : constant, 2. vary randomly, 3. vary systematically.
