Christopher Eppig and his colleagues found that there was a significant relationship between a country's median IQ score and that country's __________.

Question

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The study by Eppig and colleagues found a significant negative correlation between a country's median IQ score and its infectious disease burden, meaning that countries with higher rates of infectious diseases tended to have lower median IQ scores. There was no significant relationship between IQ scores and average age, educational attainment, or median income.

Christopher Eppig and His Colleagues Found That There Was a Significant