F Test Calculator

The F test calculator compares the equality of two variances..
It also validates the data normality, checks the test power, identify the outliers and generates the R syntax.

  Enter summarized data: SD, n
  Enter raw data directly
  Enter raw data from excel

F test calculator

Target: To check if the difference between the population's standard deviations of two groups is significance, using sample data
The f statistic calculator compute the p-value, the F statistic, and the test power.
H0: σ1 = σ2
H1: σ1 σ2
F statistic
Fn1-1,n2-1 =S12
F distribution
F distribution two tailed


Normal DistributionNormal distribution - the F test for variances is very sensitive to the normality assumption.

Required Sample Data

standard deviationS1, S2 -Sample standard deviations of group1 and group2.
sample sizen1, n2 - Sample size of group1 and group2.