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IQ and Race
Cory Plunk4-27-05
Physics/CF3333
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IQ Tests
• Popularized in modern form during WWI
• Uses analogies, pattern recognition, and other factors to measure IQ
• Must be carefully created to avoid cultural bias
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Cultural Bias
Romeo is to Juliet as Tristan is to (a) Carmen (b) Elizabeth (c) Isolde
(d) Marguerite vs
Continue the series:X 0 0 0 0 X X X 0 0 0 X X X 0 0__
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Jensen
• 1969: Arthur Jensen, educational psychologist from U. of California began publishing his work that showed a large racial correlation with IQ
• Jensen claimed his work shows a genetic component to IQ
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Results
• Showed Whites to be 15 IQ points above Blacks on average
• Discounted major influence from cultural or environmental influence other than SES (Socioeconomic Situation)
• Based claim off studies of mixed-race persons and adopted persons
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Biological Mother
Avg. IQAdoptive Parents
Avg. Adoptee IQ
% Adoptees IQ 120+
% Adoptees IQ 120+
Low IQ:Avg. 89.4
High IQ:Avg. 121.6
110.8
114.8
102.6
118.3
0
44
15
0
Average IQAdoptive fathers 120.8Adoptive mother 118.2Natural Children of adoptive parents 116.7White/Black adoptees 109.0 (half Black half White parentage)Black/Black adoptees 96.8
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Problems
• Fails to disprove cultural & environmental effects
• No hard evidence• Genetics do not support theory• Conflicting studies• What is race?
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% of Black Pop % Above 125 IQ % Above 140 IQ N 28.3 22.2 21.4NNW 31.6 46.0 42.9NW 25.3 15.9 21.4NWW 14.8 15.9 14.3Source: Flynn, 81
N = “All” BlackNNW = Mostly BlackNW = Half Black Half WhiteNWW = Mostly White
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