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The numbers of successes and the sample sizes for independent simple random samples from two populations...

The numbers of successes and the sample sizes for independent simple random samples from two populations are x1=15, n1=30, x2=59, n2=70. Use the two-proportions plus-four z-interval procedure to find an 80% confidence interval for the difference between the two populations proportions. What is the 80% plus-four confidence interval?

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