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Provide an appropriate response. In the context of a two-sample z-test for two population proportions, which of the following statements about the pooled sample proportion, p p, is/are true? A. It estimates the common value of pi and p2 under the assumption that the null hypothesis is true. B. It is a parameter. C. It is obtained by averaging the two sample proportions p and p 2. D. It is equal to the proportion of successes in both samples combined. A and D A and C O B and C O B and D