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In random samples of 97 females and 500 males, 19 of the females and 100 of...

In random samples of 97 females and 500 males, 19 of the females and 100 of the males said they earn more than $80,000 per year. Find an 80% confidence interval for the difference between the proportions of females and males who earn more than $80,000 per year.

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