This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.1)

ChiSquareCI

ChiSquareCI[var, df]
gives a confidence interval based on a 2 distribution with df degrees of freedom.
  • ChiSquareCI[var, df] gives a confidence interval {min, max}for a population variance estimated by var.
  • For confidence level , min=var df/q(1+)/2 and max=var df/q_((1-alpha)/2) where qi is the ith quantile of a 2 distribution with df degrees of freedom.
  • ChiSquareCI is the confidence interval for a population variance based on a sample variance var estimated from a sample of size df+1.
  • The following option can be given:
ConfidenceLevel0.95probability associated with a confidence interval
Needs["HypothesisTesting`"]
A 95% confidence interval based on a 2 distribution:
In[2]:=
Click for copyable input
Out[2]=