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40 per cent abilities average I.Q. cent of failures chances in 100 chronological age ranging coefficient of variation Dearborn Formboard decile tables DOCTOR OF PHILOSOPHY dren F F F factors Fb.I Dbn Fb.I Wtmr Fb.II Arith ficiency fifth grade children fifth grade level grade level group greater than zero group and sub-group Group Cases Mean group succeed group VI consisted high reverse span Intelligence Quotient M.S. Rev Mean Sigma diff Mean Sigma Sk mental age middle 40 months to fourteen obtained difference performance tests Psychological Clinic Quotient Group range of chronological regarded relative intellectual efficiency relative proficiency relative superiority reliability respect to I.Q. retardation for grade retarded children reverse memory span secured by testing statistical treatment TEST RESULTS test scores third grade children third grade level total group true difference greater University of Pennsylvania V. P.E. Mean Sigma visual memory span whole group Witmer Cylinder test Witmer Formboard