Statistics > Confidence Intervals > 2-Population Variance

This utility computes the confidence intervals for the ratio of two population variances (σ12 / σ22). The confidence intervals are calculated using the following formula:

where s1 and s2 are the sample standard deviations of two population samples, FL is the lower critical value (inverse F probability distribution at α/2, where α is the significance level), and FR is the upper critical value (inverse F probability distribution at 1 - α/2).

Dialog Inputs

The sample data can be inputted in one of three ways:

The confidence level must be between 0 and 1. For example, enter 0.95 for a 95% confidence level.