Construct a 95% confidence interval for (p1 - p2) in each of the following situations:
a. n1 = 400, p̂1 = .65; n2 = 400, p̂2 = .58
b. n1 = 180, p̂1 = .31; n2 = 250, p̂2 = .25
c. n1 = 100, p̂1 = .46; n2 = 120, p̂2 = .61
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