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p = x/n = 622/1091 = 0.5701
The Z for 99% CI is 2.576
The 99% CI given by :
p +/- Z*sqrt(p*p'/n)
= .5701 +/- 2.576*sqrt(.5701*(1-.5701)/1091)
= 0.5315 to 0.6087
Answer: (0.5315, 0.6087)
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