Statistics › Section K · The chi-square distribution › Topic K.5
Choosing the right chi-square test
Three tests share one statistic: the same formula, the same degrees-of-freedom logic, the same right tail. What differs is the design that produced the counts - and the design, read honestly, names its test.
In this topic
- One statistic, three tests
- The decision guide
- The shared arithmetic
- Worked example: six scenarios classified
- Worked example: one table, two designs
- The 2 x 2 bridge to the z test
- When none of the three fits
- Common mistakes to avoid
- Key takeaways
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