A study of the reliability of mental tests as used in Oklahoma City

Abstract

Entering children have been tested with the Binet, and intermediate pupils with the Otis Self-Administering Test, by the teachers, who have been trained for this purpose; the custom of retesting upon entering a new school, without consulting the former test record, makes possible this study on the more mobile part of the school population. 260 such retests were available, with an average interval of 11 or 12 months; the average Binet IQ was 100 and the average Otis IQ 95. There are no significant differences as between the two tests used; considering Binet alone, the reliability increases markedly in going toward the middle of the range from either direction. The average of the second tests is nearer the mean than the average of the first tests in all ranges (50-140). (PsycINFO Database Record (c) 2016 APA, all rights reserved)