A Researcher Wants to Construct a 90% Confidence Interval for the Proportion

Multiple Choice

A researcher wants to construct a 90% confidence interval for the proportion of elementary school students in Seward County who receive free or reduced-price school
Lunches. A state-wide survey indicates that the proportion is 0.50. Using this estimate,
What sample size is needed so that the confidence interval will have a margin of error of
0) 1?

A) 5
B) 7
C) 68
D) 42