# Understanding the Chi-square?

Six Sigma – iSixSigma Forums Old Forums General Understanding the Chi-square?

Viewing 7 posts - 1 through 7 (of 7 total)
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• #46099

Allthingsidiot
Participant

A sample of 10 items were  drawn from  a  normal universe whose variance is  25,the  variance from  the  sample  is  35
Should  we  accept the  hypothesis?if  yes  why?
I  need  only  hints ,appreciate  your  cooperation.Please those  who  want to  repeat  “do  your  home-work” are  not  invited  to  participate..
thanks

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#151917

Hypotenuse
Participant

What is a normal universe?
What is the hypothesis?

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#151920

Allthingsidiot
Participant

Good  Questions?

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#151951

BritW
Participant

You haven’t posed a hypothesis to reject/fail to reject.

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#152019

BTDT
Participant

ATI:Hint: Based on the sample(N=10), is the variance of the population equal to 25? Look for a formula about variances that contains a value for sample variance, a value for population variance and a sample size.Cheers, BTDT

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#152032

Allthingsidiot
Participant

Thank You BTDT
I came  out  with  a  SD  between  4.32 and 9.73 ,using  the  formula  and  the  appropriate Chi-table

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#152050

Sigmordial
Member

Is your desired confidence 90% or 95%?  Your interval reflects a 90% confidence interval.

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