An intelligence quotient is a(n):
A) midpoint in a set of intelligence test scores that is computed after the scores are ordered from the highest to the lowest.
B) measure of the variability of intelligence test scores that is computed by taking every score in the distribution and determining how much it differs from the mean.
C) statistical estimate of the proportion of the total variance in intelligence that is attributable to genetic differences among individuals within a group.
D) measure of intelligence originally computed by dividing a person's mental age by his or her chronological age and multiplying the result by 100.

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Quizplus · Accepted Answer

An intelligence quotient (IQ) is a measure of intelligence originally computed by dividing a person's mental age (as assessed by intelligence tests) by his or her chronological age and multiplying the result by 100. This method was developed by French psychologist Alfred Binet in the early 20th century and is still used in various forms today. Option A describes a median, not an IQ. Option B describes standard deviation, not an IQ. Option C refers to heritability, which is a separate concept from IQ.

An Intelligence Quotient Is A(n)