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Author Topic:   this is the only one I have trouble with............
crashfrog
Member (Idle past 1791 days)
Posts: 19762
From: Silver Spring, MD
Joined: 03-20-2003


Message 14 of 36 (40471)
05-16-2003 8:41 PM
Reply to: Message 13 by DC85
05-16-2003 8:35 PM


Re: the end? infinity
Welcome to the questions that have been spinning the heads of philosophers since time immemorial.

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crashfrog
Member (Idle past 1791 days)
Posts: 19762
From: Silver Spring, MD
Joined: 03-20-2003


Message 22 of 36 (40865)
05-21-2003 4:44 AM
Reply to: Message 21 by Perdition
05-21-2003 4:10 AM


Re: probability
Assuming the coin was not weighted in any way, and the testing was unbiased, the previous results would not affect the next flip. Therefore, the answer to your question would be 3) not 1).
It's a trick question. The bigger question is, "If a coin lands heads-up every time for ten flips, is it reasonable to assume that it is an unweighted coin?" The answer is "probably not."
Your answer is of course correct if you assume an unweighted coin. The original question very specifically doesn't assume this.
In the real world, coins are sometimes weighted and tests are sometimes biased. If a coin lands heads-up every time in ten flips, it's more likely than not that something fishy is going on. Ergo, the correct answer is that the eleventh time will probably be heads again.

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crashfrog
Member (Idle past 1791 days)
Posts: 19762
From: Silver Spring, MD
Joined: 03-20-2003


Message 30 of 36 (41030)
05-22-2003 1:49 PM
Reply to: Message 27 by NeilUnreal
05-21-2003 9:35 PM


Everything I know about statistics I learned from cartoons. Specifically, the Cartoon Guide to Statistics...

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crashfrog
Member (Idle past 1791 days)
Posts: 19762
From: Silver Spring, MD
Joined: 03-20-2003


Message 32 of 36 (41191)
05-24-2003 2:48 AM
Reply to: Message 31 by Rrhain
05-24-2003 1:29 AM


No, the answer is that you don't know since there is not enough information to give an answer.
Mm, I disagree - I think you're being too picky. There's enough information to be reasonably sure - not totally, of course - what's going on: it's either a biased flip or a loaded coin.
Can we be totally sure? No, of course not. But the question doesn't ask "what will definately happen next?", just "what will probably happen next?"
Nonetheless, I think the point has been made. But I forgot what it was, come to think of it.
Anyway, Rrhain, by your own logic from another thread, your answer is no answer at all.

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