Question

The following confidence interval is obtained for a population proportion, p: (0.707, 0.745). Use these confidence interval limits to find the margin of error, E.

Answer 1

When they give us all this data and asks us to find the margin of error we can use the next formula 
margin of error = (0.745 - 0.707) / 2 = 0.019 
 There is your answer. I hope this helps you a lot