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Validity
Validity refers to the extent to which a concept, conclusion, or measurement is well-founded and likely corresponds accurately to the real world.
Content Validity
The extent to which a test or measure covers the content it's supposed to cover.
Error Score
The part of a test score that is random and contributes to the unreliability of a test.
Observed
Pertains to the actual data or outcomes collected and recorded in a study or experiment.
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