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Statistics Don’t Lie, People Do!



Scholastic Assessment or g?

The relationship between the Scholastic Assessment Test and general cognitive ability.


There is little evidence showing the relationship between the Scholastic Assessment Test (SAT) and g (general intelligence). This research established the relationship between SAT and g, as well as the appropriateness of the SAT as a measure of g, and examined the SAT as a premorbid measure of intelligence. In Study 1, we used the National Longitudinal Survey of Youth 1979. Measures of g were extracted from the Armed Services Vocational Aptitude Battery and correlated with SAT scores of 917 participants. The resulting correlation was.82 (.86 corrected for nonlinearity). Study 2 investigated the correlation between revised and recentered SAT scores and scores on the Raven’s Advanced Progressive Matrices among 104 undergraduates. The resulting correlation was.483 (.72 corrected for restricted range). These studies indicate that the SAT is mainly a test of g. We provide equations for converting SAT scores to estimated IQs; such conversion could be useful for estimating premorbid IQ or conducting individual difference research with college students. 

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Source: SAGE Journal 

Schooling, Intelligence, and Income


In this article, the authors examined the evidence for linkages among 3 variables: schooling, intelligence, and income. They concluded that intelligence and schooling have a bidirectional relationship, with each variable influencing variations in the other. Moreover, changes in both schooling and intelligence influence variations in economic outcomes. Although any single study of the interdependency of these 3 variables can be criticized on the grounds that the data are correlational–and consequently are open to alternative interpretations—when viewed together, the evidence for their linked causality is quite convincing: Each increment in school attendance appears to convey significant increases not only in economic and social returns but also in psychometric intelligence. Thus, the value of schooling appears to extend beyond simply schooling’s direct effect on income.

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Source: American Psychologist, Vol 52(10), Oct, 1997. Special Issue: Intelligence and Lifelong Learning. pp. 1051-1058.