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An Empirical Study of the Stability of a Group Mean in Relation to the Distribution of Test Items Among Pupils

Author(s):
Johnson, M. Clemens; Lord, Frederic M.
Publication Year:
1956
Report Number:
RB-56-10
Source:
ETS Research Bulletin
Document Type:
Report
Page Count:
13
Subject/Key Words:
Group Testing, Test Construction, Test Format, Test Items

Abstract

Two alternative procedures of measuring group achievement under limited testing time are defined and empirically compared with respect to their efficiency in estimating a group mean and ranking a number of groups. The procedures are (A) administering the same set of items to each student in a group, and (B) administering a different set of items to each student in the group. Item scores on a college mathematics examination are employed in the comparisons.

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