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Methodology Review

Cynthia Tran Psychology Inglés 7 fichas

Fichas del conjunto (7)

1Independent variableAny variable that is systematically varied (manipulated) by the researcher.
Question always asked is: Does IV affect/cause DV?
2Dependant variableAny variable that is measured or observed.
Question always asked is: Does IV affect/cause DV?
3Extraneous variableAny variable that is not the IV but may affect the DV.
Affects internal validity (as it weakens an valid inference of IV on DV).
4Negative effects of extraneous variablesMakes it harder to see effects of IV by adding variability ("error" or "noise").
If correlated with IV (confounding variable) makes it impossible to determine true effects on IV on DV.
5Eliminate extraneous variables by:Eliminate (outside noise).
Hold constant.
Measure and include in analysis.
Randomise allocation in groups.
6Random AllocationIs the only method that allows for control of thousands of extraneous variables that researchers don't know about and can't measure.
Without it researchers can never be sure whether difference observed is might be due to a confounding variable.
It "unconfounds" by ensuring there is no systematic differences between groups.
It doesn't eliminate
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