Statistics › Section M · The F distribution and ANOVA › Topic M.1
One-way ANOVA and the F ratio
Two groups were compared with t tests; three or more demand a bigger instrument. Analysis of variance asks whether several group means differ by weighing variation BETWEEN the groups against variation WITHIN them - one F ratio, one verdict.
In this topic
- Three means, one question
- The idea: between versus within
- The F ratio
- Computing the pieces
- Worked example: three teaching methods
- Worked example: reading the methods' verdict
- The ANOVA table
- Conditions
- Common mistakes to avoid
- Key takeaways
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