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In regards to variability in mathematics performance, a meta-analysis by Lindberg et al. (2010) found male-to-female variance ratios ranged from 0.88 to 1.34 across studies with an average of 1.07, indicating nearly equivalent male and female variances. [10]
An intelligence quotient (IQ) is a total score derived from a set of standardized tests or subtests designed to assess human intelligence. [1] Originally, IQ was a score obtained by dividing a person's mental age score, obtained by administering an intelligence test, by the person's chronological age, both expressed in terms of years and months.
In the United States, the Supreme Court ruled in the case Atkins v. Virginia, 536 U.S. 304 (2002) that states could not impose capital punishment on people with "mental retardation", defined in subsequent cases as people with IQ scores below 70. [citation needed] This legal standard continues to be actively litigated in capital cases. [79]
In 1982, Daniel R. Vining, Jr. sought to address these issues in a large study on the fertility of over 10,000 individuals throughout the United States, who were then aged 25 to 34. The average fertility in his study was correlated at −0.031 with IQ for white women and −0.086 for black women.
Intelligence quotient (IQ) tests do correlate with one another and that the view that the general intelligence factor (g) is a statistical artifact is a minority one. IQ scores are fairly stable during development in the sense that while a child's reasoning ability increases, the child's relative ranking in comparison to that of other ...
Intelligence as measured by Psychometric tests has been found to be highly correlated with successful training and performance outcomes (e.g., adaptive performance), [76] [77] [78] and IQ/g is the single best predictor of successful job performance; however, some researchers although largely concurring with this finding have advised caution in ...
The WAIS-IV was standardized on a sample of 2,200 people in the United States, ranging in age from 16 to 90. [12] The demographic characteristics of the sample were modeled after the proportions of different groups in an analysis of data from the U.S. Census Bureau. An extension of the standardization has been conducted with 688 Canadians in ...
Brain size is known to differ between men and women, for example (men on average have larger bodies than women), but without well documented differences in IQ. [46] A 2017 study found that the brains of women have a higher density of grey matter, which could compensate for the loss of volume. [53]