In the context of a hypothesis test for two proportions, which of the following statements about the pooled sample proportion, p, is/are true? i. it estimates the common value of p 1 p1 and p 2 p2 under the assumption of equal proportions. ii. it is obtained by averaging the two sample proportions modifyingabove p with caret 1 p1 and modifyingabove p with caret 2 p2. iii. it is equal to the proportion of successes in both samples combined.