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I don't know enough about STATs to get the XKCD comic. Anyone care to explain?

Something about how P < 0.05 still doesn't mean there is a link between green Jelly Beans and acne?

P < 0.05 means that the probability of seeing the observed results if there is no difference is less than 1 in 20. So, if you run the experiment 20 times, you'd expect to see a link once, even if there is really no link.

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