PSY211 Exp. Designs Word Scramble
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| Question | Answer |
| Between Subjects design | Participants recieve only one treatment. High internal validity, controls time threats; BUT requires many subjects. |
| Within Subjects design | Participants recieve ALL treatments. Fewer participants required, random error reduced; BUT time and order effects. |
| Within Subjects: Time threats | Attrition, Mortality, History, Maturation, Instrumentation, Regression towards the mean. |
| Within: Time threats - Attrition | Participants dropping out of the study. |
| Within: Time threats - Mortality | Participants dying during the study. |
| Within: Time threats - History | Participant's personal experience affecting study. |
| Within: Time threats - Maturation | Participants may change from first trial to last trial. |
| Within: Time threats - Instrumentation | Mechanical flaw/error in the study. |
| Within: Order effects | Treatment/length of time involved in study has negative effect on participants (Carry-over, testing effects) |
| Within: Limiting/eiliminating carry-over effect | Counterbalancing: changing the order of the administration of the treatment(s). |
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pichelle
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