UsableStats: I am comparing 2 proportions of patients (before and after the introduction of a new quality-of-care

Question 208:

Asked on May 27, 2008

I am comparing 2 proportions of patients (before and after the introduction of a new quality-of-care project). The project is expected to reduce the proportion of patients with a particular disease. Is a one-sided test of significance enough to prove that?

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