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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