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Author Topic:   Statistics 101
NosyNed
Member
Posts: 9004
From: Canada
Joined: 04-04-2003


Message 63 of 199 (386690)
02-22-2007 11:52 PM
Reply to: Message 23 by crashfrog
02-22-2007 12:17 PM


nope crash you are wrong.
What are the odds of tossing a head on a coin with a head on both sides:
Very nearly 1.
The fact that is isn't a fair coin is a new piece of information that needs to be taken into account when calculating the odds.
If I hold a confirmed lottery ticket matching the winning numbers then the odds that I HAVE won are very nearly 1. I have a new piece of information upon which to recalculate the odds.
Before the draw I all I know is that there are 146 million possible outcomes and I only have one random one of those. On that basis I calculate my odds.
After the draw there is only ONE possible outcome and I know that I have that on my ticket. Now I calculate my odds again.

This message is a reply to:
 Message 23 by crashfrog, posted 02-22-2007 12:17 PM crashfrog has replied

Replies to this message:
 Message 65 by crashfrog, posted 02-23-2007 12:08 AM NosyNed has not replied

  
NosyNed
Member
Posts: 9004
From: Canada
Joined: 04-04-2003


Message 64 of 199 (386692)
02-22-2007 11:59 PM
Reply to: Message 30 by crashfrog
02-22-2007 3:24 PM


Watch the tense Crash
So you've won. The odds of that happening are 1 in 146 million.
That is only true BEFORE the draw.

This message is a reply to:
 Message 30 by crashfrog, posted 02-22-2007 3:24 PM crashfrog has replied

Replies to this message:
 Message 66 by crashfrog, posted 02-23-2007 12:09 AM NosyNed has replied

  
NosyNed
Member
Posts: 9004
From: Canada
Joined: 04-04-2003


Message 67 of 199 (386696)
02-23-2007 12:21 AM
Reply to: Message 66 by crashfrog
02-23-2007 12:09 AM


number of outcomes
I'm coming back to re emphasize the odds calculations:
BEFORE the draw there are 146M possible outcomes.
AFTER the draw -- for that particular lottery there is exactly ONE possible outcome -- the one drawn. All the other numbers are no longer possible outcomes.

This message is a reply to:
 Message 66 by crashfrog, posted 02-23-2007 12:09 AM crashfrog has replied

Replies to this message:
 Message 68 by Taz, posted 02-23-2007 12:38 AM NosyNed has not replied
 Message 76 by crashfrog, posted 02-23-2007 9:45 AM NosyNed has not replied

  
NosyNed
Member
Posts: 9004
From: Canada
Joined: 04-04-2003


Message 145 of 199 (387297)
02-27-2007 4:59 PM
Reply to: Message 144 by riVeRraT
02-27-2007 4:38 PM


figuring it out
I don't see how anyone could figure out the odds for the question you quoted.
Maybe you don't see but it can be done in a reasonably straight forward manor.
You could play the same number in the lotto for 146million times, and never win.
Yes and you can calculate the odds of that happening as well.

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 Message 144 by riVeRraT, posted 02-27-2007 4:38 PM riVeRraT has not replied

  
NosyNed
Member
Posts: 9004
From: Canada
Joined: 04-04-2003


Message 149 of 199 (387313)
02-27-2007 7:31 PM
Reply to: Message 148 by Phat
02-27-2007 6:00 PM


My calculations (suspect)
By my calculations when you have played 100 million times (same number or not) your odds of winning reach close to 50%. If you play the other 46 million times your odds of winning get to be amost 2 out of 3.
But you have a bit more than a 1 in 3 chance of still not winning.

This message is a reply to:
 Message 148 by Phat, posted 02-27-2007 6:00 PM Phat has not replied

  
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