Upon signing president coolidge commented america

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Upon signing, President Coolidge commented, "America must remain American." Publicized race-group differences on Army IQ tests and claimed Americans were unfit for Democracy One of many scientists (including Galton and Terman) that inspired scientific racism movement in Europe & U.S. Goddard (continued)
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Robert Yerkes Founded first non- human primate research lab Chaired committee that created the Army Alpha and Beta intelligence tests used in U.S. during World War I
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David Wechsler Obtained Ph.D. in 1925 Chief psychologist at Bellevue Psychiatric Hospital from 1932-1967 Developed several intelligence tests, including Wechsler Adult Intelligence Scale (WAIS) and the Wechsler Intelligence Scale for Children (WISC). Born in Rumania, emigrated to U.S. at age 6 Worked as a psychological examiner in army during WWI
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WAIS Popularity WAIS
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Defining Intelligence “Global capacity to act purposefully, to think rationally, and to deal effectively with the environment” (David Wechsler) 1987 survey of 1020 experts on intelligence Abstract reasoning (99.3%) Problem-solving ability (97.7%) Capacity to acquire knowledge (96.0%) Memory (80.5%) Adaptation to environment (77.2%)
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Intelligence vs other types of tests Aptitude tests measure a narrow range of ability Achievement tests measure what you know or what you learned/achieved Question: What is the SAT? Answer: A multiple aptitude test (related to intelligence)
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SAT to IQ conversion table SAT V+M IQ 15 SD %ile SAT V+M IQ 15 SD %ile 1600 152.18 99.975 1010 109.46 73.587 1590 151.45 99.970 1000 108.74 71.985 1580 150.73 99.964 990 108.01 70.338 1570 150.00 99.957 980 107.29 68.647 1560 149.28 99.949 970 106.56 66.916 1550 148.56 99.940 960 105.84 65.149 1540 147.83 99.929 950 105.12 63.347 1530 147.11 99.916 940 104.39 61.516 1520 146.38 99.901 930 103.67 59.659 1510 145.66 99.883 920 102.94 57.780 1500 144.94 99.863 910 102.22 55.883 1490 144.21 99.840 900 101.50 53.972 1480 143.49 99.813 890 100.77 52.052 1470 142.76 99.782 880 100.05 50.128
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Relationship between SAT and IQ 1. For SAT scores before 1996 IQ = (0.126 x SAT combined) + (-.4.71E - 5 x SAT combined x SAT combined) + 40.063 (Detterman and Frey, Case Western Reserve Univ.) 2. For SAT scores from 1996 -2004 IQ =(0.095 X SAT Math) + (0.003 X SAT Verbal) + 50.241 Scores for SAT were "re-centered" in 1996, raising the average SAT back to 500 (Detterman and Frey, Case Western Reserve Univ.) “SAT to IQ conversion is an inexact science, particularly for SAT's under 900. The chart's creator writes: "The lowest point of reference was the theoretical average IQ of high school students being 110 and the current average SAT I V+M (verbal + math) score being 1019. Everything below that is extrapolation. Also note that the decimal places give the impression that the numbers are more precise than they really are."
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WAIS Verbal Subtests
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WAIS Performance Subtests Picture Completion Picture Arrangement Block Design Object Assembly Digit-Symbol Substitution
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Interpreting IQ scores
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Interpreting IQ scores (normal curve)
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The Flynn Effect (1995 data) IQ scores tend to rise 3 points every 10 years
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Does IQ matter? How can we tell? Data indicate IQ and school performance (GPA) r=.50 for elementary and high school students r=.40 for college students IQ and years of education (r=.50, see next slide) IQ and occupational attainment (r=.50) Likely due to very high correlation (r= mid .60s) between education and occupation IQ and job performance (rs= .27 to .47)
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IQ and Education
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IQ and education/occupation (same data)
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IQ tests’ strengths and weaknesses
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The IQ racial gap
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Possible explanations for the gap The tests are bad Genetic differences Environmental differences
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Are the tests (racially) biased?
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  • Fall '16
  • Lyubansky
  • Psychology, Intelligence quotient, Wechsler Adult Intelligence Scale, IQ tests

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