Your statistical commentary is wrong. For any trait distributed within a population we would expect all subsets of the population to have the same distribution (with varying degree of certainty depending on the size of the subset). If 20% of all Canadians are left handed then we should expect that 20% of all people with blue eyes are left handed. Demento's analysis is correct, if twice as many men are entering computer science (for whatever reason) then we should expect to see twice as many male programmers. Your suggestion that Google isn't hiring the norm and therefore the general population ratios don't apply is factually incorrect. If there are 100 male CS majors at a university and 50 female then we would expect twice as many men to be "exceptional" (however you want to measure that) as women.

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