Educability-and-Group-Differences-1973-by-Arthur-Robert-Jensen

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Technical Misconceptions and Obfuscations 63 Mental Group White Negro Ratio: W%/N% I 7-3 0-4 18-25 II 36-1 6-6 5-47 III 38-3 30-7 1-25 IV 18-0 59-5 0-30 Administrative Acceptees* 0-3 2-8 0-11 • Draftees who failed the mental tests but who were declared administratively acceptable on the basis of personal interviews From the above figures, and assuming normality of the distribution of AFQT scores and equal sigmas for whites and Negroes, one may infer from the table of areas under the normal curve that there was 0-99
64 Educability and Group Differences Lowest percent of failures in any state: White = 0-6 percent (Rhode Island) Negro = 7-4 percent (Wisconsin) Sigma difference = l*06cr ~ 15-9 IQ points. Second-lowest percent of failures in any state: White = 0-9 percent (Minnesota) Negro = 11*1 percent (California) Sigma difference = l-29cr c* 19-4 IQ points. Comparison of highest white and lowest Negro failure rates: Highest white = 9-7 percent (Tennessee) Lowest Negro = 7-4 percent (Wisconsin) Sigma difference = 0-15er ~ 2-25 IQ points (in favor of Negroes). Comparison of lowest white and highest Negro failure rates: Lowest white = 0-6 percent (Rhode Island) Highest Negro = 46-7 percent (Mississippi) Sigma difference = 2-43a ~ 36*45 IQ points. Comparison of second-highest white and second-lowest Negro failure rates: Second-highest white = 9-4 percent (Kentucky) Second-lowest Negro = 11*1 percent (California) Sigma difference = 0*11 o ~ 1-65 IQ points (in favor of whites). Thus, we see that in contrast to the data noted by Klineberg from World War I, when the Negro medians of four Northern states exceeded the white median of four Southern states, in 1968 there are only two pairs of states (Tennessee and Wisconsin, and Kentucky and Wisconsin) in which Negroes obtain higher AFQT scores, on the average, than whites. In this 1968 sample, the mean score of white males in Tennessee would correspond to 95, i.e., 5 points below the whites’ national average, on an IQ scale, while the mean score of Negro males in Wisconsin would be 97*25, i.e., nearly 13 points above the Negroes’ national average. Since the AFQT is clearly predictive of individuals’ capabilities in learning and performance in the armed forces, the above figures
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Educability & Group Differences Art
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THE AUTHOR Since 1957 Dr. Arthur R.
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Ediicability and Group ^
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To the memory of Sir Cyril Burt e d
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List o f Tables 3.1 Correlations am
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17.3 Theoretical regression lines b
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2 Educability and Group Differences
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10 Educability and Group Difference
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114 Educability and Group Differenc
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7 Race differences in intelligence
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8 Multiple and partial correlation
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244 Educabilty and Group Difference
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14 Teacher expectancy Credence in t
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ig Physical environment and mental
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20 Recapitulation The study of abil
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Appendix on Heritability Heritabili
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References a in s w o r t h , m . d
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398 Author Index Davis, A., 300 Dea
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400 Author Index Nichols, R. C., 10
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Author Index 401 Warren, B. L., 120
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cultural deprivation, 258 culture-b
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Making Xs Test of speed and persist
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Stanford-Binet Intelligence Scale,
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