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Educational and Psychological Measurement
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A Prediction Interval for a Score on a Parallel Test Form

Frederic M. Lord

Educational Testing Service

Given any observed number-right score on a test, a method is described for obtaining a prediction interval for the corresponding number-right score on a randomly parallel form of the same test. The interval can be written down directly from published tables of the hypergeometric distribution.

Educational and Psychological Measurement, Vol. 41, No. 2, 359-364 (1981)
DOI: 10.1177/001316448104100213
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