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Error Variance
The portion of variability in a set of scores that is not accounted for by the predictor variables in a study, attributable to unknown factors or measurement errors.
Construct Validity
The extent to which a test or experiment measures what it claims to measure.
Hypothetical Construct
An abstract concept that is created for a scientific theory or research and cannot be directly observed.
Generalizability
The extent to which research findings and conclusions can be applied to larger populations or different contexts beyond the original study.
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