Reddit reviews Psychological Testing: Principles, Applications, and Issues (PSY 430 Intimate Relationships)
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I'm not an expert. There is a lot of dispute about these, but I guess few would dispute that sub-saharan africans score lower than african americans on iq-tests and that both score lower than europeans.
The American black-white iq-test-score gap is cited as uncontroversial in wikipedia and in my psychological testing textbook http://www.amazon.com/Psychological-Testing-Principles-Applications-Issues/dp/0495095559
The estimates of African IQ are less studied. This can lead you to study the issues: http://www.sciencedirect.com/science/article/pii/S0160289609001275
It's a comment that says that estimates African IQ very low, but you can find the study that claims the african iq higher somewhere about at 80 which is still under the african american iq.