Construct a confidence interval for p1 - p2 at the given level of confidence.
x1 = 395, n1 = 537, x2 = 432, n2 = 552, 99% confidence.
The researchers are __% confident the difference between the two population proportions, p1−p2, is between __ and __.
(Use ascending order. Type an integer or decimal rounded to three decimal places as needed.)
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