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- Newsgroups: alt.folklore.science
- Path: sparky!uunet!think.com!spool.mu.edu!agate!boulder!news
- From: juola@bruno.cs.colorado.edu (Patrick Juola)
- Subject: Re: More Monty Hall
- Message-ID: <1992Dec21.230241.19209@colorado.edu>
- Sender: news@colorado.edu (The Daily Planet)
- Nntp-Posting-Host: bruno.cs.colorado.edu
- Organization: University of Colorado, Boulder
- References: <1992Dec18.165746.10294@cbfsb.cb.att.com> <1h4fbgINN5c5@nz12.rz.uni-karlsruhe.de> <1992Dec21.214559.22343@berlioz.nsc.com>
- Distribution: usa
- Date: Mon, 21 Dec 1992 23:02:41 GMT
- Lines: 28
-
- In article <1992Dec21.214559.22343@berlioz.nsc.com> worden@bouncer.nsc.com (Dennis Worden) writes:
- >
- >
- >Now reword the situation a little:
- >After Monty opens the door with the goat behind it, he then asks you to
- >choose between the remaining two doors, one with the prize, and the other
- >with the goat. You have a 50% chance of picking the correct one (remember,
- >the third door does not exist in the wording). You have a 50% chance
- >of picking the correct door here. You have the same information as before,
- >the only change is that instead of asking you to "switch", you are asked
- >to "pick from start". Either way, you have two doors in front of you,
- >and one prize.
-
- Doesn't follow. It's still "new" information, and you still have a 67%
- chance of winning if you pick the door that you didn't pick at first.
-
-
-
- >Monty hasn't given you new information, he has given you a new
- >question. At the point where he asks you if you want to switch, the fact
- >that you had a 33% chance previously doesn't affect you new decision; two
- >doors, one prize.
-
- The fact that the door which used to be closed is now known to be a loser
- is new information. Specifically, if I guessed a goat (probability 2/3),
- then he's now shown me where the winner is.
-
- - kitten
-