[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%

Execute     [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}

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