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