Peer reviewedERIC Number: EJ061302
Record Type: CIJE
Publication Date: 1972
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Why is a Longer Test Usually a More Reliable Test?
Ebel, Robert L.
Educational and Psychological Measurement, 32, 2, 249-53, Sum 72
Author supports the credibility of the propositions that: (1) the true component of a score is proportional to the number of equivalent elements that contribute to it. And, (2) the error component of a score is proportional to the square root of the number of equivalent elements that contribute to it. (Author/MB)
Descriptors: Error of Measurement, Item Analysis, Mathematical Applications, Scores, Test Reliability, True Scores
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