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Jul 10th, 2015

n = 110, x = 68 ; 88%
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sample proportion: p-hat = 68/110 = 0.618

therefore E = 1.56*sqrt[0.618*0.382/110] = 0.0722

hence 88% CI: 0.618-0.0722 < p < 0.618+0.0722

or 0.5458<P<0.6902 (Answer)

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