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📸 Fisher's Exact Test via SPSS Crosstabs → Chi-Square statistics
When Is Fisher's Exact Test Used?
Fisher's Exact Test is used for 2×2 contingency tables when chi-square assumptions are violated: specifically, when expected cell frequencies are below 5. While chi-square is an approximation, Fisher's test calculates the exact probability of obtaining the observed table (or more extreme) under the null hypothesis.
Rule of thumb: use Fisher's Exact Test when any expected frequency in a 2×2 table is below 5, or when n<20.
Running Fisher's Test in SPSS
📸 Fisher's Exact Test output
APA Reporting
Fisher's exact test indicated a significant association between treatment group and recovery status, p=.047. Fisher's exact test was used because expected cell frequencies were below 5 (minimum expected = 2.8).
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