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NaturalBeam 
LSU Fan
Member since Sep 2007
12300 posts
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:21 pm to WDE24)
quote:
But at the beginning there was a 96% chance of 1$ right?
IF there were 25 cases of $1, right. But for the way the game is actually played (26 unique #s), it will do you no good to switch cases b/c eithe of your 2 remaining cases could be either remaining amount 50-50.
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WDE24
Alabama A&M Fan
Member since Oct 2010
32492 posts
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:22 pm to threeputt)
It is the fact that Monty is eliminating a door he knows is wrong and will never reveal the car that mathematically differentiates the two, right?
Every time I'm convinced I get it, I doubt myself.
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Tiger1242
LSU Fan
Member since Jul 2011
13260 posts
 Online
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:23 pm to threeputt)
quote:
but there are only two left and each has the same odds .. does no good to switch ...
Yes there are two left and they have the same odds. But a large factor of the case you picked originally still being there is because it's the one you picked originally. It is very unlikely you picked correctly originally, therefore switching is the smart decision
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threeputt 
Notre Dame Fan
God's Country
Member since Sep 2008
18935 posts
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:23 pm to NaturalBeam)
quote:
ut for the way the game is actually played (26 unique #s), it will do you no good to switch cases b/c eithe of your 2 remaining cases could be either remaining amount 50-50.
it does not matter if the cases had unique numbers or not ... the last two cases are 50/50 for your desired result (if you get down to that point)
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LSUBoo 
Bowling Green Fan
My Posting Goes To 11.
Member since Mar 2006
54394 posts
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:23 pm to Tiger1242)
quote:
What I'm saying, and maybe not explaining it very well, is that it is very unlikely that you picked the case you were trying to pick at the beginning.
Not as unlikely as eliminating 24 straight wrong cases.
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NaturalBeam
LSU Fan
Member since Sep 2007
12300 posts
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:23 pm to Tiger1242)
quote:
I see your point and if you were trying to pick the $1 case originally than you shouldn't switch. I realize this is not like the Monty Hall situation and it isn't 96% chance your case is the wrong one. What I'm saying, and maybe not explaining it very well, is that it is very unlikely that you picked the case you were trying to pick at the beginning. So if you have a chance to switch with better odds, you should switch IMO
My point is that it doesn't matter which case I subjectively want to pick. I've picked a case, and eliminated 24 others. There is my case left and 1 other. It doesn't matter which 2 values are left on the board (In this case, let's say they miraculously are $1 and $1M), there are equal odds of it being either.
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threeputt
Notre Dame Fan
God's Country
Member since Sep 2008
18935 posts
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:23 pm to WDE24)
quote:
It is the fact that Monty is eliminating a door he knows is wrong and will never reveal the car that mathematically differentiates the two, right?
correct
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LSUBoo
Bowling Green Fan
My Posting Goes To 11.
Member since Mar 2006
54394 posts
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:23 pm to Tiger1242)
quote:
Yes there are two left and they have the same odds.
He gets it!
quote:
It is very unlikely you picked correctly originally, therefore switching is the smart decision
Oh. Never mind.
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Tiger1242
LSU Fan
Member since Jul 2011
13260 posts
Online
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:24 pm to WDE24)
quote:
It is the fact that Monty is eliminating a door he knows is wrong and will never reveal the car that mathematically differentiates the two, right?
For the Monty Hall situation yes, someone with knowledge eliminated an option he knew was wrong, so the odds are now on the favor of the one he did not eliminate
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threeputt
Notre Dame Fan
God's Country
Member since Sep 2008
18935 posts
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:24 pm to Tiger1242)
quote:
. It is very unlikely you picked correctly originally, therefore switching is the smart decision
 it is very unlikely that the OTHER case left has the million as well .. they both have the same odds of having the million
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WDE24
Alabama A&M Fan
Member since Oct 2010
32492 posts
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:25 pm to Tiger1242)
Not switching is a choice with 50/50 odds a well. Your theory to switch seems to indicate that not switching isn't a 50/50 choice.
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Northgate
LSU Fan
Member since Jul 2012
2190 posts
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:25 pm to Tiger1242)
(no message)
This post was edited on 3/6 at 9:15 pm
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WDE24
Alabama A&M Fan
Member since Oct 2010
32492 posts
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:26 pm to Northgate)
Yep. Bet the house on it.
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manwich 
UCF Fan
You've wanted my
Member since Oct 2008
51044 posts
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:26 pm to Tiger1242)
quote:
Yes there are two left and they have the same odds. But a large factor of the case you picked originally still being there is because it's the one you picked originally. It is very unlikely you picked correctly originally, therefore switching is the smart decision
this logic has converted me. i'm switching
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OneMoreTime 
SMU Fan
Florida Gulf Coast Fan
Member since Dec 2008
40717 posts
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:27 pm to LSUBoo)
quote:
Not as unlikely as eliminating 24 straight wrong cases.
Yeah, it seems like it would be more unlikely for the million dollar case to be out there and for you to eliminate 24 straight $1 cases than it is for you to have picked the million dollar case to start with. Don't feel like running the odds on that though.
This post was edited on 3/6 at 3:28 pm
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Tiger1242
LSU Fan
Member since Jul 2011
13260 posts
Online
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:28 pm to threeputt)
quote:
it is very unlikely that the OTHER case left has the million as well .. they both have the same odds of having the million
I know the odds shifted and it's 50/50, I'm just switching based on the fact that the only reason the case I picked is still around is because I picked it, it was likely I picked wrong.
I'm really only referring to the unlikely situation that the $1,000,000 was still around. I'm just assuming I didn't pick the $1,000,000 off the bat.
I'd probably take the deal anyway
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threeputt
Notre Dame Fan
God's Country
Member since Sep 2008
18935 posts
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:29 pm to OneMoreTime)
quote:
Don't feel like running the odds on that though.
I hear you .. that is too hard ... nobody got time fo dat
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NaturalBeam
LSU Fan
Member since Sep 2007
12300 posts
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:29 pm to threeputt)
quote:
it does not matter if the cases had unique numbers or not
It does matter. If you started with a $1M case and 25 $1 cases, you have a 3.8% chance of picking the $1M case. If (big if) you then eliminated 24 other cases and were still left with the $1M, you still only have a 3.8% chance of having picked the $1M initially. You had a 96.2% chance of picking a $1 case.
If you have 26 unique cases, eliminated 24 of them, and are left with 2 amounts ($1 and $1M), it doesn't matter if you switch b/c you had only a 3.8% chance of picking $1M AND you only had a 3.8% chance of picking $1.
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WDE24
Alabama A&M Fan
Member since Oct 2010
32492 posts
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:30 pm to OneMoreTime)
Well I think that statement btu me is mathematically incorrect.
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Tiger1242
LSU Fan
Member since Jul 2011
13260 posts
Online
| re: Computer Simulations from yesterday's Let's Make a Deal problem. (Posted on 3/6/13 at 3:31 pm to WDE24)
quote:
Not switching is a choice with 50/50 odds a well. Your theory to switch seems to indicate that not switching isn't a 50/50 choice.
No I know it's 50/50, but when I first chose there was a 96% chance I chose wrong. So even if I've narrowed it down to where I have a 50% chance that I chose correctly I'm switching just based on the fact that when I originally chose there was a small chance I picked the right one. In reality it doesn't matter I guess
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