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Doesn't prove anything. Sometimes you don't get enough sleep and do poorly on a test. Sometimes you just have a great day. Using statistics as though they are h

• 3pt14159 16y ago
  Does it 100% prove it? No. But what he can easily do is call up the top 200 most suspected students, get them to sit down in an office with nothing but a calculator and a pen and give them a very small subset of the original questions with the numbers changed. 20 people might be able to get them right, but a good 50 people arn't going to know where to start for any of the questions. Then all of a sudden it is "oh shit" time. If I were one of the "cheating" students I would come forward too. This actually happened when I was studying engineering at Waterloo. The course was calculus 3 and the prof, who normally taught math majors, didn't know that there was a university commissioned exam bank with previous exams for courses. Course coverage was sporadic for all but final exams, so we normally didn't check it, but the previous midterm was actually there. One of us found it 24 hours before the midterm, so half of us got it and half of us didn't. The prof had reused the hardest question. Long story short, nobody got in trouble, but the prof made it so your top and bottom "midterm" (there were 5 of them before the final) could be optional dropped together or not at all.