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?
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.