chi-square

mandarine · 11-05-2009, 05:01 AM

I´m 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..

vinux · 11-05-2009, 07:08 AM

this link may help
http://www.fourmilab.ch/rpkp/experim...s/chiCalc.html

or use CHDIST function in excel.
=1-CHIDIST(30,26)

mandarine · 11-05-2009, 12:18 PM

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?

Dragan · 11-05-2009, 08:49 PM

Quote:

Originally Posted by mandarine

Thanks but I need to be able to do this without excel or matlab.

Why?...i.e. What is the reason?

mandarine · 11-06-2009, 05:19 AM

Just because...I havent asked why

It´s just my teachers rules.
Can you help?

vinux · 11-06-2009, 09:58 AM

If your Calculator support integration then you can do it.
Integrate pdf 0 to 30 ,
pdf is

here k =26, gamma(k/2) = 12!

mandarine · 11-08-2009, 07:14 AM

is there no other way? Can´t I use some chi square table or some?
I really don´t understand any of this

11-05-2009, 05:01 AM	#1
mandarine Junior Member Join Date: Sep 2009 Posts: 26 Thanks: 3 Thanked 0 Times in 0 Posts	chi-square I´m 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.

11-05-2009, 07:08 AM	#2
vinux Little Master Join Date: Jun 2008 Location: India Posts: 1,105 Thanks: 5 Thanked 262 Times in 258 Posts	this link may help http://www.fourmilab.ch/rpkp/experim...s/chiCalc.html or use CHDIST function in excel. =1-CHIDIST(30,26) __________________ Richie aka Vinu CT

11-06-2009, 09:58 AM	#6
vinux Little Master Join Date: Jun 2008 Location: India Posts: 1,105 Thanks: 5 Thanked 262 Times in 258 Posts	If your Calculator support integration then you can do it. Integrate pdf 0 to 30 , pdf is here k =26, gamma(k/2) = 12! __________________ Richie aka Vinu CT

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11-05-2009, 12:18 PM	#3
mandarine Junior Member Join Date: Sep 2009 Posts: 26 Thanks: 3 Thanked 0 Times in 0 Posts	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?

11-06-2009, 05:19 AM	#5
mandarine Junior Member Join Date: Sep 2009 Posts: 26 Thanks: 3 Thanked 0 Times in 0 Posts	Just because...I havent asked why It´s just my teachers rules. Can you help?

11-08-2009, 07:14 AM	#7
mandarine Junior Member Join Date: Sep 2009 Posts: 26 Thanks: 3 Thanked 0 Times in 0 Posts	is there no other way? Can´t I use some chi square table or some? I really don´t understand any of this

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