No one really knows why the best estrogen players are typically not as good at chess as the testosterone players. One theory, common among some top testosterone players, is that testosterone usually induces more aggressive behavior by nature than estrogen, and is therefore the better suited hormone for a game that simulates warfare. Another, cited in at least one university study, is that the talent pool among estrogen filled players has not been big enough to produce many great players."
... chiropractor required...
Wait a minute..
...having already made up their minds and not wishing to be confused with the facts, they go there to have their preconceptions re-enforced.
This is true, and the exact same thing these "surveyors" were doing.
On a side note, how is the title of this slashdot summary any better than what Fox News does?
The University of California Statistics Department; where mean is normal, and deviation standard.