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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 theraphy. Paul randomely selcts 150 diabetic patients to study their occurrence ( yes or no)  of diabetic ketoacidosis (DKA) before and after pump therapy. Are the data paired?

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

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