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ability achievement American analysis average basic become behavior believe called child concept concerned correlation course cultural determination differences disadvantaged discussion distribution early effects environment environmental equal estimate evidence example existence experience fact factors families function gains genetic given heritability human important increase individual influence institutions instruction intellectual intelligence interaction interest involved issues Jensen kind learning less major mean measure ment mental nature Negro normal parents performance persons political population position possible present problems Professor programs psychological question race reading reared reason reported Review scores seems selection social society structure studies suggests teachers teaching tests theory things tion twins University variance York