alt Hacker NewsThis is just an extrapolation of NAEP testing. It's more or less a chart of SES and how many students in each state need English language supports.
People tend to believe without questioning it that there are geographical/regional surveys of "IQ". But have you ever been compelled to take an IQ test as part of a survey like that? I've never heard of that happening. In fact: those kinds of surveys do not exist.
Yeah. The linked source is upfront about that, but its the closest thing we have to a real study sadly. As I said, the averages are close anyhow.
Scholars have from time to time thrown their careers away by trying to get better numbers, inevitably some group doesn't like the outcome and they become embroiled in endless debate while their career implodes. For example, the major sources cited in The Bell Curve have had their titles stripped and been hounded to the ends of the earth.
All these years later people are still specifically authoring papers to debunk their work.
https://www.sciencedirect.com/science/article/abs/pii/S01602...
We will never see real numbers. This, or other things like it, are literally the best it will ever get unless someone sacrifices their career, and maybe their own safety, to gather better data.