First, I would like to thank Mr. Olson for making my point. Without his response I would not have seen how he fundamentally misunderstood the point I was making. This is evident in his second paragraph where he responds to an argument I didn't make or assumes that I share views in common with people with whom he has disagreed in the past. Without this diversity of viewpoints I would not have understood this. Moreover, it suggests a line of conversation that might enlighten us both. Here I am imagining a discussion informed by the work of Professor Banaji on implicit bias, for example.
Second, as to the claims Mr. Olson makes in his first paragraph I can only conclude that he is unfamiliar with the experimental and cognitive psychology studies that would provide the data he is seeking. He needs but to look. I would recommend the work of Professor Sommers on juries, Professor Loyd and Phillips on the impacts of diversity on group process and information sharing, or the work of Professor Claude Steele as well as the previously referenced work by Professor Page. There is a great deal of research being done right now. It is useful and instructive even if not completely dispositive.