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Culture War Roundup for the week of September 5, 2022

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If we assume your IQ starts at 0 at birth

Sort of tangential to your main point, but IQ doesn't have a known zero anchor point, like temperature or height do. The figure of 100 as the average was arbitrarily chosen, as was the figure of 15 points to represent one standard deviation. It is therefore theoretically possible to have a negative IQ (though that would be as unlikely as having an IQ over 200). That also means that if you are anchoring your mean and your SD to the population as a whole, some subgroups will end up not only with average IQs higher or lower than 100, but also with a larger or smaller SD if their cognitive abilities are more or less widely distributed than the population as a whole.

Perhaps it would have made more sense to set the average at zero, then it would be simple to see that negative IQ just meant below average, and the number of people with X points below average would be mirrored by a comparable number of people with X points above average

Alfred Binet created a test of cognitive ability for French school children. IQ was previously a quotient of scores that correspond to mental age over chronological age for children times 100. That doesn’t work well for adults. They changed it to the standard deviation method where the norm was just 100. I think the reason was likely that 100 was already the norm for a child of perfectly average mental age. I’m not certain though.