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Old 11-05-2009, 05:01 AM   #1
mandarine
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chi-square

Iīm supposed to solve a chi-square problem:

P{(X^2)26} <= 30

This is a chi square random variable with 26 degrees of freedom.
The answer is 0.7325

How do you solve this?

I tried to use the chi-square table but I dont get it..

Last edited by mandarine; 11-05-2009 at 05:36 AM.
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Old 11-05-2009, 07:08 AM   #2
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this link may help
http://www.fourmilab.ch/rpkp/experim...s/chiCalc.html

or use CHDIST function in excel.
=1-CHIDIST(30,26)
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Old 11-05-2009, 12:18 PM   #3
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Thanks but I need to be able to do this without excel or matlab.
I do have TI98 calculator and a chi-table.

Can you show me either way?
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Old 11-05-2009, 08:49 PM   #4
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Quote:
Originally Posted by mandarine View Post
Thanks but I need to be able to do this without excel or matlab.
Why?...i.e. What is the reason?
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Old 11-06-2009, 05:19 AM   #5
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Just because...I havent asked why Itīs just my teachers rules.
Can you help?
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Old 11-06-2009, 09:58 AM   #6
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If your Calculator support integration then you can do it.
Integrate pdf 0 to 30 ,
pdf is
here k =26, gamma(k/2) = 12!
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Old 11-08-2009, 07:14 AM   #7
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is there no other way? Canīt I use some chi square table or some?
I really donīt understand any of this
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