Educational Psychology / Unit 13 EDP 1203 short lesson, about 20 seconds
Two Kinds of IQ
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The idea
The original ratio IQ divided mental age by chronological age and multiplied by one hundred; the modern deviation IQ places a score among same-age peers on a scale with a mean of one hundred and a standard deviation of fifteen.
In practice
Average scores have risen about three points a decade, the Flynn effect.
Where people slip
Modern tests report deviation scores.
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