13. The 90% confidence interval for the proportion of busy signals encountered by customers is [0.05, 0.13]. What is the margin of error for this

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13. The 90% confidence interval for the proportion of busy signals encountered by customers is [0.05, 0.13].

What is the margin of error for this confidence interval?

A. This calculation requires a standard error.

B. 0.01

C. 0.08

D. 0.04

E. 0.02

The Answer is D but I need help solving the question by showing work.

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