An educator wants to construct A 95% confidence interval level for the proportion of elementary school children in Colorado who are proficient in reading.

The results of a recent statewide test suggested that the proportion is 0.77. Using this estimate, what sample size is needed so that the confidence interval will have a margin of error of 0.04?

A sample of ____ Elementary school children is needed to obtain 95% confidence interval with a margin of error of 0.04.