Answer: It is short for intelligence quotient. An Intelligence quotient, or IQ,
is score derived from one of several standardized tests designed to assess
intelligence. The abbreviation “IQ” comes from the German term Intelligenz-Quotient,
originally coined by psychologist William Stern. When current IQ tests
are developed, the median raw score of the norming sample is defined as IQ 100
and score each standard deviation (SD) up or down are defined as 15 IQ points greater
or less, although this was not always so historically. By this definition, approximately
95 percent of the population scores an IQ between 70 and 130, which is within
two standard deviations of the mean.
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