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A Prediction Interval for Score on a Parallel Test Form

Author(s):
Lord, Frederic M.
Publication Year:
1978
Report Number:
RB-78-05
Source:
ETS Research Bulletin
Document Type:
Report
Page Count:
10
Subject/Key Words:
Equated Scores, Mathematical Formulas, Probability, Scoring, Statistical Analysis

Abstract

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. (10pp.)

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