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51 families According to I.Q. according to occupational according to sex Alpha children approximately Army Alpha average and superior average I.Q. Biometrika born chil Child Correlations child rating Children According compared comparison conclude correlation of 802 difference divided according dren Elderton epilepsy Father Above Mother Fathers Mothers Galton Grade Grade III growth limit higher I.Q. Distribution I.Q. of Offspring individual Inferior Parent intelligence quotient Jour Mean I.Q median Alpha score median I.Q. mental ability mental age mental traits mid-child I.Q. Mid-Daughter Mid-Son obtained a correlation Occupational Distribution occupational groups Occupational Status order of birth pairs of siblings Parent-Child Resemblance Parents According parents and children Pearson percentage Plate population present study primary education ranged from 64 sample second child shows single child standard error Stanford-Binet children superior mid-children Superior Parent Thorndike tion unskilled variability younger children