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extraneous variables and confounding variables; A HERMIT

Assignment Bias

failure of random assignment


an outside event influences Ps' scores in one condition more so than another

Environmental variables

environments differ from one treatment condition to another

regression (to the mean)

extreme scores at one point in time tend to be less extreme at next measurement


Ps grow or change over course of study


changes in measuring over time affect results

Testing effects (Order effects)

practice, fatigue

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