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DOI: 10.1177/0013164487472005 Determining Optimal Test Lengths with a Fixed Total Testing TimeUniversity of Massachusetts at Amherst The problem of determining optimal test lengths with fixed total testing time has proven to be a difficult one for criterion-referenced test developers. A solution is offered in this paper in which test lengths are determined by considering the importance, reliability, and validity of scores measuring objectives in a criterion-referenced test with a constraint set on the total desired test length.
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