For my academic friends, although I'd suggest anyone who's been through post-secondary education should watch this for the kind of lecture you would have wanted to be on the right end of.
When I first saw this I was assuming he was fibbing in order to get them to confess, to be honest... admittedly, my understanding of statistics is extremely minimal, but there's something about the wimping out on the penalty to those who did cheat that makes me wonder just how sure they were.
The place I first saw this being discussed (here: http://www.metafilter.com/97736/The-UCF-Cheating-Scandal ), there was a lot of speculation basically along the lines of "He has no idea who the cheaters are, which is why he's throwing out everyone's grades." that sounded pretty reasonable to me, but I don't know anything about how this sort of thing works.
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