[Sample Data]  (input either sample data or sample statistics using csv / bsv)
      
[Sample Statistics]
Sample Size n = ( > 1)
Sample Variance s2 = ( > 0)
[Confidence Level]
      1 - α     95% 99%
[Sampling Distribution]   ChiSquare Distribution

    [Confidence Interval]

χ2n-1 ; 1-α/2 = χ2n-1 ; α/2 =
[ (n-1)s2 / χ2n-1 ; α/2 , (n-1) s2 / χ2n-1 ; 1-α/2  ] ⇔ [    ,  ]


  n = 2 200    1-α = 0.60 0.99