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A tax preparing service samples 400 returns from each of its 2 local offices and checks for errors. The office 1 sample has a 4%

A tax preparing service samples 400 returns from each of its 2 local offices and checks for errors. The office 1 sample has a 4% higher error rate than the office 2 sample. The pooled proportion for the two sample is 0.12. Based on these samples, is there significant evidence at the 5% level that the offices have different error rates?

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