Source is here. SD for Asians and Europeans is 35, SD for Africans was 85. N=20,000.
What's wrong here? 4 degrees of accuracy for brain size and no error bars? That's a sign of someone being either intentionally or unintentionally dishonest.
...no? Why in the world would he present error bars? The numbers are in line with other studies, without massive uncertainty, and irrelevant to his actual, stated and quoted, point.
His stated point is about telling things that everybody is supposed to know.
If you have an SD of 35 for an average of 1362 you have no idea about whether the last digit should be a 2. That means either you do state an error interval or you round to 1360.
Human height changed quite a bit over the last century. http://www.voxeu.org/article/reaching-new-heights-how-have-europeans-grown-so-tall . Taking data about human brainsize with 4 digit accuracy and assuming that it hasn't changed over the last 30 years is wrong.
European gained a lot of bodymass over the ...
Another month has passed and here is a new rationality quotes thread. The usual rules are: