A study of the intelligence and achievement of full-blood Indians

Abstract

The subjects were 1000 full-blood Indians (tribes not given) in government and church schools, ages about 12 to 18, grades 4 to 9. They were given the Otis Classification Test, Part I measuring educational achievement and Part II intelligence. All ages and quotients rise somewhat with grade; the average IQ is 70, the average accomplishment ratio 107 (range 105 to 111) which is higher than that for whites (overlapping 79%). By means of a regression equation intelligence score is predicted from age, grade, and achievement score, the respective weights being—1, 2.5, and 8; the multiple correlation is 0.84; the partial correlation between intelligence and achievement, holding age and grade constant, is 0.67. From these facts the authors conclude that there is "little room for any other factor besides school grade and achievement in education in determining intelligence score for full-blood Indians." (PsycINFO Database Record (c) 2017 APA, all rights reserved)