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The sample variance, S2, can be used to estimate the population variation.
Criterion-related Validity
The extent to which a measure is related to an outcome or criterion, testing how well one measure predicts an outcome for another measure.
Construct Validity
The extent to which a test measures what it claims to be measuring.
Construct Validity
The degree to which a test measures what it claims to be measuring, specifically the ability of a measurement tool to actually measure the theoretical construct it intends to measure.
Criterion-related Validity
The extent to which a test's scores correlate with another measure or outcome that it is theoretically expected to predict.
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