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The current version of the test, the WAIS-IV, which was released in 2008, is composed of 10 core subtests and five supplemental subtests, with the 10 core subtests yielding scaled scores that sum to derive the Full Scale IQ. With the WAIS-IV, the verbal/performance IQ scores from previous versions were removed and replaced by the index scores.
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.
[31] [32] Not all report test results as "IQ", but most now report a standard score with a mean score level of 100. When a test-taker scores higher or lower than the median score, the score is indicated as 15 standard score points higher or lower for each standard deviation difference higher or lower in the test-taker's performance on the test ...
In general, higher IQ scores are associated with better outcomes in life. [11] However, while IQ test scores show a high degree of inter-test reliability, and predict certain forms of achievement effectively, their construct validity as a holistic measure of human intelligence is considered dubious.
Most IQ tests are designed to yield a mean score of 100 with a standard deviation of 15; the 98th-percentile score under these conditions is 130.8, assuming a normal distribution. [14] However, American Mensa does not provide a score comparable to scores on other tests; the test serves only to qualify a person for membership. [15]
The WRIT is an attempt to optimize accuracy in a short-form IQ test that includes fewer subtests. [5] The test was developed with a stratified sample of 2,285 people aged 4 to 85. [1] The test was published by British testing company Pearson in 2000; its manual was written by Joseph Glutting, Wayne Adams, and David Sheslow.
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