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Research Psych
Definitions
Term | Definition |
---|---|
Main Effect | the independent effect of one IV on the DV in a factorial design |
Factorial Design | a research design in which there is more than one IV, and every IV level is present at all levels of the other IVs |
Interaction | occurs when the effects of one IV on the DV change depending on the level of the other IV |
Response Acquiescence Effect | tendency of subjects to respond "yes" to questions they have thought little about |
Confound | nuisance variable that varies non-randomly with the IV |
Random Factor | IV whose levels were chosen randomly from a population of possible values |
Fixed Factor | IV whose levels were not chosen randomly |
Floor Effects | occur when the DV is so low that it is unlikely the IV will affect it |
Ceiling Effects | occur when the DV is so high that it is unlikely the IV will affect it |
Nuisance Variables | any variable other than the IV that can affect the DV |
Type I Error | finding an effect of the IV on the DV when no effect exists |
Type II Error | not finding an effect of the IV on the DV when an effect exists |
Dependent Variable | variable the researcher measures to determine effects of the IV |
Independent Variable | variable for which the researcher chooses values |
Within Subjects Design | a research design in which each subject receives all levels of the IV |
Between Subjects Design | a research design in which each subject receives one level of the IV |
Correlational Approach | a research technique in which the researcher determines whether variables are related without manipulating the variables |
Naturalistic Observation | a research technique in which the researcher simply observes and describes behavior to answer simple questions and to generate research ideas |