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adults anthropologist Army Alpha average Binet age Booklet boys cent chronological age classification coefficients compared comparison correlation critical ratio Diff difficulty Disc Downey dynamometer errors examination factors feebleminded girls give given group tests high school Indian indicate individual athletes individual tests ingenuity tests Intelligence Quotient intelligence tests investigation Johns Hopkins University Kent-Rosanoff Knight Dunlap mental age Mental Measure mental tests method motor ability Nashville negroes nonathletes nonparticipants normal norms o.o o.o obtained oo.o oooo ooooo ooooo ooooo Otis percentage of successes physical present primitive probably problem Psychol questions race difference racial reaction records reliable response Rosanoff sheet Spanish-American speed standard statistical sub-tests subjects subnormal superior tachistoscopic tapping team athletes team group Terman test scores time-limit tion twelve-year-old University of Minnesota VIII words work-limit writer year-level York