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T-Tests: World Championship Butlers

I've heard some claims that a number of pairs were playing significantly worse than normal in Wroclaw, with a clear implication that they were cheating in previous World Championships, had ceased doing so based on recent improvements in security, and consequently had seen their scores decrease.

 

I am curious whether anyone has done any serious statistical work to address this hypothesis.  If so, plese let me know.  If not, I'll probably start running some T-Tests or some such...

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