Confidence Intervals for Proportions

Question

You want to obtain a sample to estimate a population proportion. At this point in time, you have no reasonable estimate for the population proportion. You would like to be 98% confident that your estimate is within 0.2% of the true population proportion. How large of a sample size is required?

Answer 1

sample size = 0.25 * (2.33/0.002)^2 = 339306.25 --> sample size = 339307