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13 Cards in this Set

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 Independant variable Causes variablity in the Dependent Variable; "treatment" or "intervention" Dependent variable Presummed to be affected by Independent Variable; observed & measured by researcher If A, then B.... A = Independent variable B = Dependent variable Experimental vs quasiexperiemental experiemnets Experimental = randomized Quasi-experiemental = can't randomize Internal validity Allows researcher to determine: 1) if there is a statistically significant relationship bt variables 2) If observed behavior is a causal one External validity if relationship bt variables generalizes Threats to Internal validity 1) History 2) Maturation 3) Statistical regression 4) Selection = when subjects from one group initially differ from subjects in other groups in important ways Threats to External validity REACTIVITY: 1) Demand caharacteristics = cues that inform participants how they are expected to act 2) Hawthorne effect = tendency to perform better b/c of the attention they are receiving because of being a participant 3) Experiemntal expectancy = experimenter unintentionally providing cues about the purpose of the experiment ORDER EFFECTS (overcome with counterbalancing) Between group designs Comparisons of levels of IV are made across different groups Within subject design each subject recieves all levels of IV at different times Mixed designs combines BGD and WSD Factorial designs - Used whenever study includes 2 or more IV - Provides info on main effects and interaction effects - Interaction effect is when the effects of one IV are different at different levels of another IV Single subject designs - includes at least one baseline phase and one treatment phase -DV is measured repeatedly during each phase of study - multiple baseline designused when removal of tx would be undesirable