Determine the sample size for the estimation of the population proportion for the following, where p is

Question:

Determine the sample size for the estimation of the population proportion for the following, where p̂ is the sample proportion based on a preliminary sample.
a. E = .025, p̂ = .16, confidence level = 95%
b. E = .05, p̂ = .85, confidence level = 90%
c. E = .015, p̂ = .97, confidence level = 99%