Validity is the extent to which differences in observed scale scores reflect true differences among objects on the characteristic being measured,rather than systematic or random errors.

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Validity refers to the degree to which a test measures what it claims to measure, and is related to the accuracy of the test scores in representing the construct being measured. It is important to ensure that any differences observed between groups or individuals on a test or scale are due to true differences, and not to measurement errors.

Validity Is the Extent to Which Differences in Observed Scale