Statistics › Section M · The F distribution and ANOVA › Topic M.3
Test of two variances
Which machine fills more consistently? Does this group's spread match that one's? The F distribution's second job compares two variances directly - a simple ratio test, and the tool that audits ANOVA's own equal-spreads assumption.
In this topic
- Comparing spreads
- The statistic
- Worked example: two filling machines
- Worked example: auditing ANOVA's assumption
- One-sided variance claims
- Conditions
- Reading the ratio in context
- Common mistakes to avoid
- Key takeaways
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