Since the early days of IQ testing, psychologists have periodically rewritten the tests. If the young people of today took exactly the same tests that were used many years ago,

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IQ scores are normed to have a mean of 100 and a standard deviation of 15, so if young people today took the same tests as many years ago, the mean score would still be 100, but due to the Flynn effect (the phenomenon of IQ scores increasing over time), the mean score would likely be well above 100.

Since the Early Days of IQ Testing, Psychologists Have Periodically