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EDIT: OK, wow,
now I'm starting to doubt myself. WTF, if switching is correct I don't know how many things I must have wrong.
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Yep, switching is correct. Don't feel bad. Like I said, even most math professors get it wrong. But consider that if so few can get this very simple problem right, how endemic misuse of statistics is in more complex situations.
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I finally caught my error like 10 minutes later. And then I realized that my initial statement holds no matter which answer is correct because there were a lot of elaborate explanations on both sides. [img]/images/graemlins/smile.gif[/img]