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>>IQ is highly linked to genetics. Citation desperately needed. How can you prove that empirically? What is your methodology for controlling for environmental factors in making that assertion, including factors associated with access to resources, tutors, having a full belly every morning, and not being constantly flooded with stress hormones as a result of grappling with the daily reality of living in poverty?
Existence of a correlation is enough reason to break down any analyses by demographic data to have a clearer picture of what's going on. That's just basic data science.