PSYC 201W Chapter Notes - Chapter 8: Design Of Experiments, Causal Inference, Internal Validity
4 Apr 2018
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Document Summary
Introduction: research design: the outline, plan or strategy used to investigate the research problem, how the data will be collected and analyzed, experimental research is the best way to determine cause and effect. Weak experimental research designs: sometimes threats to internal validity cannot be eliminated, when weaker designs are used, it because harder to make a causal inference. Study questions 2: what are the components and structure of the weak experimental research designs, explain why the threats to internal validity exist in each of these designs. Within-participant designs: all participants receive all conditions, repeated measures: another common name for within-participant designs, within-participants variable: type of independent variable where all participants receive all levels of the iv. Within-participants posttest-only design: all participants receive all conditions, and a posttest is administered after each condition: must use counterbalancing. If all participants are in all conditions, the only difference is the manipulation of the iv: less participants are required.
