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Independent samples of n1 = 400 and n2 = 400 observations were selected from binomial populations 1 and 2, and x1 = 100 and x2 = 127 successes were observed.
a. What is the best point estimator for the difference (p1 - p2) in the two binomial proportions?
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b. Calculate the approximate standard error for the statistic used in part (a).
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c. What is the margin of error for this point estimate?
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