Answer
.8558 +- 0.01764
Work Step by Step
p = $\frac{1288}{1505}$ = .8558
= p+- z $\times$ $\sqrt \frac{p(1-p)}{n}$
= .8558+- 1.96 $\times$ $\sqrt \frac{.8558 \times .1442}{1505}$
= .8558 +- 0.01764
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