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10 April, 02:32

Modern tests of intelligence do not use the IQ formula developed by William Stern. How do modern tests of intelligence determine the standard for "normal" intelligence is?

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  1. 10 April, 04:28
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    Modern IQ tests run off of a statistically normalized distribution. 100 is normal intelligence based on the average intelligence of the group. It also uses a spread of 15 per standard deviation (e. g. if someone is 2 standard deviations above the average, they have an IQ of 100 + 15*2=130; similarly, if someone is 2 standard deviations below the average, they have an IQ of 100 - 15*2=70).
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