You are analyzing data from your DNP project examining factors associated with positive response to a new wound care protocol in diabetic patients. You want to test whether there's an association between patient age group (under 65/65 and older) and treatment response (no improvement/improvement). In your sample of 28 patients, you notice that only 3 patients under age 65 showed improvement, resulting in a very small expected cell count. Which statistical test should you use to examine the association between age group and treatment response? McNemar test 2 x 2 Fisher's Exact test 2 x 2 chi-square test Pearson point-biserial correlation