Deviation IQ Test: Know Your Score

What does an IQ score of 115 indicate?

What percentage of the population scores above 125 on IQ tests?

What is the range of scores for about two-thirds of all test-takers according to the 'deviation IQ' definition?

What was noticed by the early developers of IQ tests regarding child IQ scores?

Why is the 'deviation IQ' method now used for standard scoring of all IQ tests?

What is the norming sample mean raw score defined as for the full-scale IQ in the Wechsler tests?

Who developed the current fifth edition of the Stanford–Binet scales (SB5)?

What is the term replaced in the alternative system for Wechsler IQ classifications?

How many examiners were trained in administering the standardized SB5 test?

What is the Woodcock–Johnson Test of Cognitive Abilities abbreviated as?

What is the reliability range for IQ across all age groups for the WAIS-IV and Stanford-Binet Intelligence Scale?

What percentage of children show significant score changes when re-tested, despite high reliability?

What is the test-retest correlation for the WAIS-IV?

What do most individually administered IQ tests report results as, with a mean score level of 100?

What is the main focus of current IQ test publishers in the classification process?

IQ Test Classification and Reliability

Historical attempts to classify intelligence predate the invention of IQ tests, relying on behavioral observations.
Early intelligence classifications by IQ testing were influenced by the definition of "intelligence" used in each case.
Current IQ test publishers prioritize reliability and error estimation in the classification process.
IQ tests generally provide reliable scores, with most individuals aged 10 and older maintaining similar scores throughout life.
The WAIS-IV and Stanford-Binet Intelligence Scale have a high reliability of 0.97–0.98 for IQ across all age groups.
Despite high reliability, around 42% of children show significant score changes when re-tested, with some experiencing declines in IQ as they grow up.
Modern IQ tests have improved in reliability, with the WAIS-IV test-retest correlation at.96.
IQ scores have an error of measurement, and test-givers should inform test-takers of the confidence interval around their scores.
Categories of IQ vary between test publishers, with labels for IQ score ranges specific to each brand of test.
Intelligence is crucial in modern life but IQ classifications are not the sole predictor of success, and other factors should be considered for individual assessments.
Wechsler intelligence scales, developed by David Wechsler, are widely used as individual IQ tests and are considered the "gold standard" in IQ testing.
Not all individually administered IQ tests report results as "IQ", but most now report a standard score with a mean score level of 100.

Test your knowledge of IQ test classification and reliability with this quiz. Explore the historical background of intelligence classification, the impact of test reliability, and the factors influencing IQ scores. Discover the nuances of IQ testing and its significance in modern life.