Experimental Designs
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| Between Subjects design | Participants recieve only one treatment. High internal validity, controls time threats; BUT requires many subjects.
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| Within Subjects design | Participants recieve ALL treatments. Fewer participants required, random error reduced; BUT time and order effects.
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| Within Subjects: Time threats | Attrition, Mortality, History, Maturation, Instrumentation, Regression towards the mean.
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| Within: Time threats - Attrition | Participants dropping out of the study.
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| Within: Time threats - Mortality | Participants dying during the study.
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| Within: Time threats - History | Participant's personal experience affecting study.
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| Within: Time threats - Maturation | Participants may change from first trial to last trial.
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| Within: Time threats - Instrumentation | Mechanical flaw/error in the study.
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| Within: Order effects | Treatment/length of time involved in study has negative effect on participants (Carry-over, testing effects)
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| Within: Limiting/eiliminating carry-over effect | Counterbalancing: changing the order of the administration of the treatment(s).
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Created by:
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