Express the confidence interval 0.039 < p < 0.479 in the form of p ± E.

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Express the confidence interval 0.039 < p < 0.479 in the form of p ± E.

We find the range of this interval:
Range = Upper Bound - Lower Bound
Range = 0.479 - 0.039
Range = 0.44

Each piece on opposite sides of p gets:
0.44/2 = 0.22

So our expression becomes
p ± 0.22