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ERIC Number: ED052241
Record Type: Non-Journal
Publication Date: 1970-Nov
Pages: 26
Abstractor: N/A
Reference Count: N/A
A Comparison of School Mean Achievement Scores With Two Estimates of the Same Scores Obtained by the Item-Sampling Technique.
Cahen, Leonard S.; And Others
The accuracy of estimating test means for groups of twelfth-grade students by the item-sampling technique was examined. The subjects were from 35 twelfth-grade schools participating in the National Longitudinal Study of Mathematical Abilities. Half of the students in each school were assigned to a treatment condition where they took a complete 24-item mathematics test on the first day of testing and took item-sampled versions of the same test on the second day of testing. A second random group of students within each of the schools took the item-sampled version of the mathematics test on day 2 but did not take the complete version of the mathematics test on day 1. There was no evidence to indicate that taking the complete 24-item mathematics test influenced the performance on the item-sampled version on the second day of testing. Reasonably close estimates of mean performance were obtained from the item-sampling situation as compared to the means estimated from the conventional type of testing. The differences between the means estimated from conventional type testing and from item-sampling testing were found to diminish as a function of the number of students tested in the school (square root transformation). (Author/PR)
Publication Type: N/A
Education Level: N/A
Audience: N/A
Language: N/A
Sponsor: N/A
Authoring Institution: Educational Testing Service, Princeton, NJ.