https://jeltewicherts.net/wp-content/uploads/2015/12/wicherts2010iqafr.pdf?utm_source=chatgpt.com
論文結尾作者說，To conclude, we have used the results from four published studies on the validity of national IQ to estimate the national IQs of sub-Saharan African countries on the basis of their means in large-scale student assessment surveys. The average predicted national IQs for Botswana, Ghana, Mozambique, Nigeria, South Africa, Swaziland, and Zimbabwe are 81.4, 70.3, 83.9, 88.3, 73.8, 90.2, and 84.6,
