Express the confidence interval 0.050, 0.140 in the form of p - e < p < p + e
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Split the interval into two halves and find the midpoint=(0.050+0.0140)/2=0.0640/2=0.0320=p. 0.0320-0.0140=0.050-0.0320=0.0180=e. 0.0320-0.0180<0.0320<0.0320+0.0180 or p-0.0180<p<p+0.0180.
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