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________ effects occur when the effects of combining two or more conditions are greater than what is individually possible.
School Performance
A measurement of academic achievement usually based on grades, standardized test scores, and other criteria.
Unknown Validity
A term indicating that the effectiveness, accuracy, or effect of something cannot be verified or confirmed.
Wide Distribution
The extensive spreading of something, such as a product, phenomenon, or piece of information, across a large area or amongst a large number of people.
Predictive Validity
The extent to which a score on a scale or test predicts future performance on a related outcome.
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