Validating laboratory tests

Unlike, for example, distance and mass, a concrete measure of intelligence cannot be achieved given the abstract nature of the concept of "intelligence".IQ scores are used for educational placement, assessment of intellectual disability, and evaluating job applicants.

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Even when students improve their scores on standardized tests, they do not always improve their cognitive abilities, such as memory, attention and speed.

In research contexts they have been studied as predictors of job performance, and income.

About 2.5 percent of the population scores above 130, and 2.5 percent below 70.

Scores from intelligence tests are estimates of intelligence.

He suggested that all mental performance could be conceptualized in terms of a single general ability factor and a large number of narrow task-specific ability factors.

Spearman named it g for "general factor" and labeled the specific factors or abilities for specific tasks s.In any collection of test items that make up an IQ test, the score that best measures g is the composite score that has the highest correlations with all the item scores.Typically, the "g-loaded" composite score of an IQ test battery appears to involve a common strength in abstract reasoning across the test's item content.They are also used to study distributions of psychometric intelligence in populations and the correlations between it and other variables.Raw scores on IQ tests for many populations have been rising at an average rate that scales to three IQ points per decade since the early 20th century, a phenomenon called the Flynn effect.This led to the development of several mental tests by Robert Yerkes, who worked with major hereditarians of American psychometrics—including Terman, Goddard—to write the test.

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