Douglas_Knight comments on Open thread, 7-14 July 2014 - Less Wrong Discussion
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Thanks for the explanation. The skill ceiling/floor argument makes sense for GCSEs, but I'm not sure how well it works for A-Levels. Boys only outperform girls at the very very top end, and despite the complaints that the ceiling isn't high enough, I don't think it can account for all the discrepancy (he said, remembering his bad stats intuition).
Maybe it's higher male variance and higher female mean?
Class grades also count for zilch in both, it was all exams last time I checked.
Percent passing is not very informative because those sitting the test have been preselected. According to this spreadsheet, 50% more boys take Maths and more than twice as many boys take further maths. Also, it claims that the A* rate is twice as high for boys, at both levels, though the A rate is the same (which is weird).
(the spreadsheet has several sheets, but the link should go to the correct one - gender)