2-Sample Variance Test (F-Test)
Analyze PhaseCompare the variability of two independent groups. Tests whether the ratio of variances is significantly different from 1. Use this before running an Independent t-Test to check the equal-variance assumption, or to compare process consistency between two lines, shifts, or suppliers.
Data Table
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Hypotheses
H₀: σ₁² = σ₂² (variances are equal)
H₁: σ₁² ≠ σ₂² (two-tailed)
Test statistic: F = s₁² / s₂², follows an F-distribution with df₁ = n₁−1, df₂ = n₂−1.
Select two metric columns to compare their variances