PSY 230 Study Guide - Final Guide: Interrupted Time Series, Wait List, External Validity
25 Apr 2017
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Document Summary
Selection effects - how you choose participants and assign groups. Order effects - the way you order your trials. There is no comparison group (a control group) Maturation - when there is a change in behavior that happens spontaneously. History - there may be one event in time that changes group behavior or attitudes. Regression to the mean - you see an extreme value, then the second value goes back closer to the average. Attrition - when participants drop out of study. Testing - when you give someone the same test twice, they"ll probably do better the second time. Instrumentation threat - instrument may not be sensitive enough. Observer bias - when the experimenter biases the way they interpret the findings. Demand characteristics - when a participant guesses what the study is about. Placebo effect - participants they receive the placebo might be convinced the treatment worked. Know what double blind and masked studies are.
