Confidence interval on Standard deviation

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Main Question or Discussion Point

I read that confidence interval on standard deviation can be found using chi-square distribution. If I have a sample size N=500, and sample standard deviation= 3 with mean=0, and I need a 95% confidence, I wasn't sure what to set for degrees of freedom in chi-square formula. Is the degrees of freedom same as the sample size? Is there an online-tool that can do the math for you if I enter the values?
 

Answers and Replies

  • #2
.Scott
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You can calculate your confidence interval with this tool:
Confidence Interval

The degrees of freedom is you sample size minus one (499), but that is not required by this tool.
 
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  • #3
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Hi,

Thanks for the reply, but I am interested in confidence interval of the standard deviation rather than the mean. The link that you mentioned doesn't contain the confidence interval for standard deviation
 
  • #5
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Thank you very much!
 

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