(a) Using P, to represent the proportion in the control group who developed diabetes and ₂ to represent the proportion in the teplizumab group who developed diabetes, find the sample difference in proportions, P₁-P2. Round to three decimal places. i 0.684 (b) Find a 99% confidence interval for the difference in proportions p₁ - P₂. Round to three decimal places. -0.02 to 0.547 (c) What is the best estimate for the difference in proportions? Round to three decimal places. i 0.227 What is the margin of error for this estimate? Round to three decimal places. i 0.229 (d) Can we be confident, at the 99% level, that the new drug teplizumab is more effective than the control? no

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