Immigration reform has focused on dividing illegal immigrants into two groups: long-term and short-term. In a random sample of 880 construction workers from the Northeast,

80 are illegal short-term immigrants. In the Midwest, 58 out of a sample of 1110 are illegal short-term immigrants.

Question: Give a 99% confidence interval for the difference in proportions (Northeast minus midwest). Assume that all necessary assumptions and conditions are satisfied.

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