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Discriminant Validity
The degree to which a concept or measurement is not associated with other concepts or measurements it's supposed to be unrelated to.
Predictive Validity
The extent to which a test, measurement, or tool can accurately forecast or predict a specific outcome.
Face Validity
Refers to the extent to which a test appears to measure what it is intended to measure, based purely on its surface characteristics.
Mean Score
The average value obtained by dividing the sum of all values in a set by the number of values in that set; used as a measure of central tendency in statistics.
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