We have given the numbers of successes and the sample sizes for simple random samples for independent

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We have given the numbers of successes and the sample sizes for simple random samples for independent random samples from two populations. In each case,

a. Use the two-proportions plus-four z-interval procedure to find the required confidence interval for the difference between the two population proportions.

b. Compare your result with the corresponding confidence interval.

x1 = 18, n1 =30, x2 =10, n2 =20; 95% confidence interval

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