This utility computes the confidence intervals for a population variance in one population. The confidnece intervals are calculated using the following formula:
where
= inverse cumulative
probability of the Chi-square distribution at
α/2.
= inverse cumulative
probability of the Chi-square distribution at
1 - α/2.
The sample size, variance, and standard deviation are displayed,
along with the resulting confidence interval for variance and
standard deviation.
Here is an example:
Confidence Interval - One population variance: confidence level = 0.95
Input: Summary data
N Variance Stdev 95.00%CI Variance 95.00%CI Stdev 100 10.000 3.162 (7.7090, 13.4949) (2.7765, 3.6735)