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Thread: Do you know the correct answer?

  1. #841
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    Default Re: Do you know the correct answer?

    Must keep the thread alive….just a bit longer….

  2. #842
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by CWSmith View Post
    This question has gotten under my skin. I woke yesterday thinking about it and that's not good.

    I can finally see the other side's view of this. I can't prove that it's wrong and I don't agree that it's right.

    I now see my own view in the same light. I can't add or detract to what's been said.

    This is going to hound me for a long time until I work it out.
    Pardon me for asking a stupid question.......................................... .................but what is your view?
    Schooner sailors love to get blown offshore!

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    Default Re: Do you know the correct answer?

    Quote Originally Posted by bluedog225 View Post
    Must keep the thread alive….just a bit longer….

    It's not looking good to hit 1000 posts.





  4. #844
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by CWSmith View Post
    This question has gotten under my skin. I woke yesterday thinking about it and that's not good.

    I can finally see the other side's view of this. I can't prove that it's wrong and I don't agree that it's right.

    I now see my own view in the same light. I can't add or detract to what's been said.

    This is going to hound me for a long time until I work it out.

    Maybe there is some contrition on the horizon?


    Quote Originally Posted by CWSmith View Post
    You can say it as many times as you want, you do not understand basic probability theory. Yes, all you are doing is restating the same belief without a logical argument. You do not understand what you are talking about. That is the most polite way I can say it.

  5. #845
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by twodot;[URL="tel:6680429"
    6680429[/URL]]It's not looking good to hit 1000 posts.




    No stopping it once we past 850. Stubborn crew.

  6. #846
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    Default Re: Do you know the correct answer?

    Hang in there CW... cipher it out. I bet you can. If you can't, you might have to come to terms with the possibility that your powers of synaptogenesis are fading, resulting in a habitual too-quick reversion to Type1 (fast/intuitive) thinking.
    David G
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  7. #847
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    Quote Originally Posted by CWSmith View Post
    This question has gotten under my skin. I woke yesterday thinking about it and that's not good.

    I can finally see the other side's view of this. I can't prove that it's wrong and I don't agree that it's right.

    I now see my own view in the same light. I can't add or detract to what's been said.

    This is going to hound me for a long time until I work it out.

    Consider the game with 100 doors. Or 1000 doors. The Harvard prof addresses it that way towards the end of his talk. It becomes much more clear that it cannot be 50/50 odds.


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    Tom

  8. #848
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by David G View Post
    Hang in there CW... cipher it out. I bet you can. If you can't, you might have to come to terms with the possibility that your powers of synaptogenesis are fading, resulting in a habitual too-quick reversion to Type1 (fast/intuitive) thinking.
    He'll work it out I'm sure, but for that other old codger synaptic plasticity comes down to elephant, umbrella, orange, bicycle.

  9. #849
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by SchoonerRat View Post
    Pardon me for asking a stupid question.......................................... .................but what is your view?
    50:50
    "Where you live in the world should not determine whether you live in the world." - Bono

    "Live in such a way that you would not be ashamed to sell your parrot to the town gossip." - Will Rogers

    "Those are my principles, and if you don't like them... well, I have others." - Groucho Marx

  10. #850
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by twodot View Post
    Maybe there is some contrition on the horizon?
    Not likely. Right or wrong, I stand behind my remark that many people have just been repeating what they read without adding understanding.
    "Where you live in the world should not determine whether you live in the world." - Bono

    "Live in such a way that you would not be ashamed to sell your parrot to the town gossip." - Will Rogers

    "Those are my principles, and if you don't like them... well, I have others." - Groucho Marx

  11. #851
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by CWSmith View Post
    Not likely. Right or wrong, I stand behind my remark that many people have just been repeating what they read without adding understanding.

    Heh, you might also consider that everyone here understood what they were repeating.

  12. #852
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by CWSmith View Post
    Not likely. Right or wrong, I stand behind my remark that many people have just been repeating what they read without adding understanding.

    The young child quickly learns that if he can turn over two of the three inverted cups, that he has a better chance of getting the coin, than if he can just turn over one cup.

    Two tries are better than one.

    If you played this game with Monte, in reality you get two tries. After you pick one cup he sets the other two cups aside. He picks one, and he always picks the cup he knows has no coin under it, and he shows you that it doesn't. Monte's pick is actually one of your picks, and if you switch from your first choice, you pick the remaining cup. This is equivalent to a second pick for you

  13. #853
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    Default Re: Do you know the correct answer?

    1/3 +0 + X = 1
    solve for X
    9th grade algebra.

  14. #854
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by twodot View Post
    You folks are messing up my nice graph showing a bell curve.
    uhhhh. . .

    Quote Originally Posted by twodot View Post




    Simpler is better, except when complicated looks really cool.

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    Default Re: Do you know the correct answer?

    Quote Originally Posted by paul pless View Post
    uhhhh. . .

    It's a bell curve, dammit!

  16. #856
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by Chris Woodward View Post
    1/3 +0 + X = 1
    solve for X
    9th grade algebra.
    Best yet.
    "For a successful technology, reality must take precedence over public relations,
    for nature cannot be fooled."

    Richard Feynman

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    Default Re: Do you know the correct answer?

    Quote Originally Posted by Chris Woodward View Post
    1/3 +0 + X = 1
    solve for X
    9th grade algebra.
    Like I said, nothing new. This is just post #1.

    9th grade algebra isn't always the solution.
    "Where you live in the world should not determine whether you live in the world." - Bono

    "Live in such a way that you would not be ashamed to sell your parrot to the town gossip." - Will Rogers

    "Those are my principles, and if you don't like them... well, I have others." - Groucho Marx

  18. #858
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    Default Re: Do you know the correct answer?

    I really do regret admitting that I was having second thoughts about this problem.

    It brought all the little people out to feel important.
    "Where you live in the world should not determine whether you live in the world." - Bono

    "Live in such a way that you would not be ashamed to sell your parrot to the town gossip." - Will Rogers

    "Those are my principles, and if you don't like them... well, I have others." - Groucho Marx

  19. #859
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by CWSmith View Post
    Like I said, nothing new.

    We don't need new. The answer to post no. 1 was well presented within the first two pages of the thread, as well as innumerable times in the following 24 pages. One presentation was less than 20 words.

  20. #860
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by CWSmith View Post
    It brought all the little people out to feel important.

    You need a break from the forum.

    As for myself, this is my last post on the forum until September 1st. I will not open the forum until September 1st.

  21. #861
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by twodot View Post

    As for myself, this is my last post on the forum until September 1st. I will not open the forum until September 1st.
    do you need internet access money?

    i have a hotspot i can loan you. . .
    Simpler is better, except when complicated looks really cool.

  22. #862
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    Quote Originally Posted by twodot View Post
    You need a break from the forum.

    As for myself, this is my last post on the forum until September 1st. I will not open the forum until September 1st.


    Enjoy your summer!


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  23. #863
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by CWSmith View Post
    Like I said, nothing new. This is just post #1.

    9th grade algebra isn't always the solution.
    Please show your equation.

  24. #864
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    Default Re: Do you know the correct answer?

    In post #6, Tom, he who posed the problem, said I was correct in post #4. (Never mind that I had no reason).

  25. #865
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by Chris Woodward View Post
    Please show your equation.
    I showed my thinking on post #24. There have been some interesting comments about it and some not so interesting.

    This is not a matter of simple algebra. It is about the logic behind it.

    It was stated in one of the posts that this problem has brought PhDs out of the woodwork to complain that the original solution is wrong. This should tell you that there are interesting questions here. I'm finding it far more interesting that I first imagined.

    And I will end with this - They do still play this game on the show and the rabid fans do not always switch. I would think that after watching the show so many times, they would know to switch if that is the right answer.
    "Where you live in the world should not determine whether you live in the world." - Bono

    "Live in such a way that you would not be ashamed to sell your parrot to the town gossip." - Will Rogers

    "Those are my principles, and if you don't like them... well, I have others." - Groucho Marx

  26. #866
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    Default Re: Do you know the correct answer?

    The chart in post 24 shows the contestant originally selecting the correct door six times out of twelve.
    I am quite certain there is a fundamental error right there.

  27. #867
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by Mcjim View Post
    The chart in post 24 shows the contestant originally selecting the correct door six times out of twelve.
    I am quite certain there is a fundamental error right there.
    You're right! And that is a very interesting observation. I had not looked at it that way. Thank you.
    "Where you live in the world should not determine whether you live in the world." - Bono

    "Live in such a way that you would not be ashamed to sell your parrot to the town gossip." - Will Rogers

    "Those are my principles, and if you don't like them... well, I have others." - Groucho Marx

  28. #868
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by CWSmith View Post

    It brought all the little people out to feel important.
    "THE LITTLE PEOPLE" hahaha


  29. #869
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by CWSmith View Post
    Like I said, nothing new. This is just post #1.
    9th grade algebra isn't always the solution.
    It is in this case. Of course it's nothing new, the correct answer has already been explained hundreds of times in myriads of different ways. This one was particularly clear and succinct.
    "For a successful technology, reality must take precedence over public relations,
    for nature cannot be fooled."

    Richard Feynman

  30. #870
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by CWSmith View Post
    Okay, Nick, I'll see if this old dog can learn a new trick:

    Contestant Picks this Door Prize is Behind This Door Monty Shows This Door Stays Switches
    1 1 2 Win Lose
    1 1 3 Win Lose
    1 2 3 Lose Win
    1 3 2 Lose Win
    2 1 3 Lose Win
    2 2 1 Win Lose
    2 2 3 Win Lose
    2 3 1 Lose Win
    3 1 2 Lose Win
    3 2 1 Lose Win
    3 3 1 Win Lose
    3 3 2 Win Lose
    Win % 0.5 0.5

    Okay, Tom, I told you what I thought was wrong with your chart. Now I'd like you to tell me what is wrong with mine.

    Edit - Sorry. I had a typo that I corrected.
    It appears that you have accounted for the same choice twice. If your first choice is correct, it make no difference which door the host opens. You win either way by not switching. But your graph shows that as two separate probabilities when it is really only one. The prize is behind Door 1,2,or3. But you have laid it out as Door 1,1,2,or 3.
    This following graph is correct.

    Quote Originally Posted by Tom Montgomery View Post
    ^
    ron ll is correct. The answer is indeed counter-intuitive which makes it an interesting puzzle.

    Intuition says that when it was revealed that an unchosen door did not contain the prize the odds changed to 50-50 and so switching the choice of doors is not advantageous.

    But the fact is that the odds never change. Given a choice of three doors, there is a 2/3 chance the prize is behind one of the other two. That does not change when it is revealed that one of the unchosen two doors does not have the prize. The odds remain only 1 in three that the prize is behind your chosen door. And the odds also remain 2 in 3 that the prize is behind one of the other two doors.


  31. #871
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    Default Re: Do you know the correct answer?

    Only 103 more to go
    WszystekPoTrochu's signature available only for premium forum users.

  32. #872
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    Default

    102, actually!



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  33. #873
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    Default Re: Do you know the correct answer?

    Bump

  34. #874
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    Default Re: Do you know the correct answer?

    Quote Originally Posted by Chris Woodward View Post
    It appears that you have accounted for the same choice twice. If your first choice is correct, it make no difference which door the host opens. You win either way by not switching. But your graph shows that as two separate probabilities when it is really only one. The prize is behind Door 1,2,or3. But you have laid it out as Door 1,1,2,or 3.
    This following graph is correct.
    No, what I've done is to recognize that the two cards held by the host are distinct. As such, they represent two choices.

    I'm counting unique choices.

    It's like saying you have two daughters. Are they interchangeable, or is each unique?

    That's the real question in this problem: are the two choices unique when counting possible realizations?

    I am beginning to think I'm wrong, but this argument really does not explain it.
    "Where you live in the world should not determine whether you live in the world." - Bono

    "Live in such a way that you would not be ashamed to sell your parrot to the town gossip." - Will Rogers

    "Those are my principles, and if you don't like them... well, I have others." - Groucho Marx

  35. #875
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    Default Re: Do you know the correct answer?

    The more important choice is not the one door that you chose. Rather it is the two doors that the host holds. This is the whole of the game.
    If he holds two goats, then either one is zero. It matters not which one you switch to, you lose. In reality this constitutes only one choice.
    Otherwise, he holds two winning choices if you switch.
    Car vs Goat,Goat. Switch and you lose. Regardless which goat he exposes.
    Goat vs Goat,Car. Switch and you win.
    Goat vs Car,Goat. Switch and you win.

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