Suppose a 90 percent confidence interval to estimate a population proportion was calculated from a sample proportion of 18 percent and a margin of error of 4 percent. What is the width of the confidence interval?

Answer: The width of the confidence interval is 8%.

Step-by-step explanation:

The width of the confidence interval is twice the margin of error.

Given : A 90 percent confidence interval to estimate a population proportion was calculated from a Sample proportion = 18 %.

Margin of error = 4 %.

Then, the width of the confidence interval = 2 x (Margin of error)

= 2 x (4%)

= 8%

Hence, the width of the confidence interval is 8%.