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Suppose you have a loaded coin, and we assume a priori that when you flip it you get heads 20% of the time and tails 80%.

If I wanted to be 99% certain that this coin is a fraud, how many times do I need to flip?

I know this involves some advanced statistics, but I can't recall?

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    Adel, your edit makes the answer to the question trivially "0 flips" because you are already assuming the coin is fraudulent. What I meant is something like: "Suppose you have a coin, and there is a 2% chance it is fraudulent (meaning it lands on heads 80% of the time), and a 98% chance it is fair. If I wanted to be 99% certain that this coin is a fraud..."2011-09-12

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