Equal Variance Test
Analyse PhaseGBTest whether two or more groups have equal variances. Uses Levene's test (robust to non-normality) and Bartlett's test (assumes normality). Required assumption check before t-test and ANOVA.
8 values
8 values
8 values
Add Group
Unequal variances
Use Welch's t-test or non-parametric alternatives (Mann-Whitney, Kruskal-Wallis).
Test Results
Levene's Test (Robust)
F Statistic
17.7710
df₁ / df₂
2 / 21
p-value
0.0000
Bartlett's Test (Assumes Normality)
χ² Statistic
17.3863
df
2
p-value
0.9470
Group Summary
| Group | n | Mean | Std Dev | Variance |
|---|---|---|---|---|
| Process A | 8 | 12.0500 | 0.2449 | 0.0600 |
| Process B | 8 | 12.0250 | 1.0820 | 1.1707 |
| Process C | 8 | 14.4000 | 0.2928 | 0.0857 |
Standard Deviation by Group