Refer to the blood type data of Exercise 10.5.3. Let p1 and p2 represent the probabilities of type O blood in the patient population and the control population, respectively.
(a) Construct a 95% confidence interval for (p1 - p2).
(b) Interpret the confidence interval from part (a). That is, explain what the interval tells you about the difference in probabilities of type O blood.
Exercise 10.5.3

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Bed rest Controls No. of preterm deliveries No. of women 32 105 20 107