intelligence quotient

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intelligence quotient

a measure of the intelligence of an individual derived from results obtained from specially designed tests. The quotient is traditionally derived by dividing an individual's mental age by his chronological age and multiplying the result by 100
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

intelligence quotient (IQ)

a unit used in the field of INTELLIGENCE measurement and testing as an index of an individual's intelligence relative to a comparable population with respect to age. A ratio IQ is the IQ expressed as a ratio of mental age (as measured by a test) to chronological age, and multiplied by 100 to avoid decimals:

The average child at any one chronological age will therefore score 100 on the appropriate set of IQ test items. This was the original IQ measure first used in 1916 in the Stanford-Binet Test.

Modern tests make use of standard scores, which express the individual's distance from the mean in terms of the standard deviation, and assume a normal distribution. In a variant of this, the deviation IQ, the mean is 100 and a standard deviation of 15 or 16 is usual.

It is important to note the difference between these measures, since the deviation IQ is not a ratio of mental age to chronological age, and the measured IQs derived from it will depend on the standard deviation used in the test. see also INTELLIGENCE TEST.

Collins Dictionary of Sociology, 3rd ed. © HarperCollins Publishers 2000

intelligence quotient

[in′tel·ə·jəns ‚kwōsh·ənt]
The numerical designation for intelligence expressed as a ratio of an individual's performance on a standardized test to the average performance according to age. Abbreviated IQ.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
References in periodicals archive ?
Probably because the last few people to tell him something he didn't want to hear ended up getting sacked or challenged to an IQ test.
11 ( ANI ): White House press secretary Sarah Huckabee Sanders has said that President Donald Trump was joking when he had challenged Secretary of State Rex Tillerson to a competitive IQ test.
To qualify for gifted status, students generally had to score at least 130 on the IQ test. However, to offset economic and linguistic disadvantages, a lower threshold of 116 applied to students who received subsidized lunches or were designated as English language learners.
For purposes of the preceding discussion of the role of standard error of measurement, and other factors affecting the interpretation of IQ scores, we have assumed that "significantly subaverage intellectual functioning" is operationalized as scoring 70 or below on a specific IQ test. While this is a useful assumption to make when explaining the effects of factors like standard error of measurement, a score of 70 or below (or any other specific cut-off score) should not be embraced by courts or state legislatures as a part of the definition of mental retardation.
In 1986, Judge Peckham expanded his 1979 order to prohibit the use of IQ tests for African-American students for any special education program.
This is a shame because Flynn is a man who, despite involvement in 'left-wing' political causes, risks provoking the fury of those very people with whom he sympathizes by defending IQ tests and highlighting -though not in this book--dysgenics (New Zealand Herald, 8 July 2007).
''Simply put, IQ tests are not a perfect measure of a person's intellectual ability,'' Hall's lawyers told the court in written arguments.
A spokesman for Mensa said: "I can confirm Niraj Kumar scored 160 on the Cattell III B IQ test which makes him eligible to join Mensa."
"Most IQ tests will have Mr and Mrs Average scoring 100 and the higher you get, the brighter you are.
Prof Flynn collated IQ test results from countries in western Europe, America, Canada, New Zealand, Argentina and Estonia.
Flynn collected IQ test results from the United States, Canada, New Zealand, Argentina and Estonia, the ( Daily Mail said -- the data showed that the differences in scores between men and women were slight.
Carter, an IQ test specialist and author of books on testing, and Russell, also an author of books on testing, present 1,000 practice questions with answers for those preparing for IQ tests in job recruitment and selection, organized into 25 tests.