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Suggested answer to exercise: Analyses for qualitative data, 4

Question 4: What method could we use to test the null hypothesis that
the two classifications are related, and why?

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Suggested answer

The expected values here must all be small, as all four of them must sum to 8.
Hence we cannot use a chi-squared tests, but must use Fisher’s exact test.
This is not significant, P = 0.067.
The invalid chi-squared test would give chi-squared = 6.00, df = 1, P = 0.014.
This would be very misleading.

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Last updated: 27 July, 2009.

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