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  #91  
Old 10-16-2007, 06:26 PM
sam_broverman sam_broverman is offline
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Default October 15, 2007 Exam P Question

You can find the question at:
http://www.sambroverman.com/pqw/oct15-07p.pdf

Sam Broverman
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  #92  
Old 10-22-2007, 06:09 PM
sam_broverman sam_broverman is offline
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Default October 22, 2007 Exam P Question

You can find the question at:
http://www.sambroverman.com/pqw/oct22-07p.pdf

Sam Broverman
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  #93  
Old 10-29-2007, 06:22 PM
sam_broverman sam_broverman is offline
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Default October 29, 2007 Exam P Question

You can find the question at:
http://www.sambroverman.com/pqw/oct29-07p.pdf

Sam Broverman
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  #94  
Old 11-05-2007, 11:36 PM
sam_broverman sam_broverman is offline
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Default Some Time Off

I will resume posting questions in several weeks.


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  #95  
Old 11-29-2007, 12:53 AM
booyaolian booyaolian is offline
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http://www.sambroverman.com/mar27p.pdf

can you explain why is it that f(x|X>200) = f(x) / P(X>200) ?
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  #96  
Old 12-03-2007, 10:33 PM
sam_broverman sam_broverman is offline
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booyaolian,

The usual formulation for a conditional density
for random variable X=s given event A is the joint
density or probability f(x,A) divided by the
probability (or density) of the conditioning event P(A),
so f(x|A) = f(x,A)/P(A) . Since the event A is X>200
the joint density of f(x,A) is either 0 if x<=200
and is f(x) if x>200 .

SB
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  #97  
Old 12-31-2007, 10:37 AM
sam_broverman sam_broverman is offline
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Default December 31, 2007 Exam P Question

I just had to post one more question before Dick
Clark drops the ball in Times Square.

The question can be found at
http://www.sambroverman.com/pqw/dec31-07p.pdf

Best wishes for a healthy, happy and exam-passing 2008.


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  #98  
Old 12-31-2007, 12:11 PM
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vjvj vjvj is offline
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Quote:
Originally Posted by sam_broverman View Post
The way the problem's worded, the P(first language is English | born outside the region) = .75.
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  #99  
Old 12-31-2007, 12:53 PM
sam_broverman sam_broverman is offline
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Vivi,

Thanks, I'll fix that wording.

SB
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  #100  
Old 01-07-2008, 10:12 AM
sam_broverman sam_broverman is offline
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Default January 7, 2008 Exam P Question

The question can be found at
http://www.sambroverman.com/pqw/jan7-08p.pdf




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