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Country Financial, a financial services company, uses surveys of adults age 18 and older to determine...

Country Financial, a financial services company, uses surveys of adults age 18 and older to determine if personal financial fitness is changing over time (USA Today, April 4, 2012). In February of 2012, a sample of 1000 adults showed 410 indicating that their financial security was more than fair. In February of 2010, a sample of  900 adults showed 315 indicating that their financial security was more than fair.

What is a 99% confidence interval estimate of the difference between the proportions at the two years, 2012 and 2010?

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