An interesting TED.com talk about how common errors with subtle statistics and simple logic can lead to so-called "expert" witnesses providing testimony that is completely and utterly incorrect. There are several very important lessons here.
TED.com video - Peter Donnelly on stats, 'experts', and fooled juries [TED.com].
Professor Sir Samuel Roy Meadow, "expert witness" [WIKI]
Sally Clark, victim [WIKI]
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