What else is there to say???
The PIAAC – Programme for the International Assessment of Adult Competencies, also called the PISA for adults, is an international survey assessing the cognitive abilities and skills of the adult populations of western countries (and several other countries too). It includes a reading comprehension assessment, a math ability assessment, and an assessment for problem solving in computer environments.
The PIAAC samples are nationally representative, with 5000-10000 people per country and include data from total of 215 000 respondents.
The tests have similarities with those from PISA, which are highly correlated with IQ. The testing was done in 2012-2013 and things could have gotten worse since then.
The tests predict IQ of 85 for US blacks, 90 for US hispanics, and 101 for US whites, which is broadly consistent with most research on this issue, as well as US SAT scores.
I decided to use math ability as a proxy…
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