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Exercise: Diabetes and high blood pressure in the 2005 M.Sc. questionnaire, 3

Question 3: What statistical method should be used to test the null hypothesis that diabetes
and high blood pressure are unrelated in this population, and why?

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Suggested answer

We have two categorical variables in a contingency table, which suggests a chi-squared test or
Fisher's exact test.
As one of the four expected frequencies, 25%, is less than five,
in fact a lot less than five, we should not use a chi-squared test, but
should use Fisher's exact test.

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Last updated: 7 November, 2006.

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