Improving control of blood-glucose levels is an important motivation for the insulin pumps by diabetic patients. However, certain side effects have been reported with pump therapy. Paul randomly selects 150 diabetic patients to study their occurrence (yes or no) of diabetic ketoacidosis (DKA) before and after pump therapy.

What test should be uses to evaluate whether the rate of DKA is different before and after start of pump therapy?

a. paired t test

b. McNemar's Test

c. Fisher's exact test

d. two-sample t test