PSYC 217 Study Guide - Quiz Guide: Scatter Plot, Observational Error, Sample Size Determination

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Does the iv cause change in dv? (or is something else at work) Key features of true experiments that help achieve internal validity. Manipulated iv(s) at least 2 levels to enable comparison. Experimental control over extraneous variables: no confounds, random assignment to conditions of iv. Developmental: aba reversal design, abab reversal design, multiple baseline design, one-group posttest only, one-group pretest-posttest, nonequivalent control group, nonequivalent control group pretest-posttest. Examples of special circumstances (often in applied contexts) Quasi-experiments: therapist testing whether a, community agency evaluating how. Single p clinical, counseling, educational, etc. Developed from need to determine if a manipulation had effect on a single p. Baseline control period (a): behaviour is measured over time. Treatment period (b): manipulation introduced, continued observation behaviour. Change in behaviour from baseline to treatment periods = manipulation is effective. Aba/withdrawal design: a baseline period b treatment period a period after treatment removed: long treatment periods.

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