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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- http://dx.doi.org/10.1002/j.2333-8504.1978.tb01152.x