Assume that a sample is used to estimate a population proportion p. Find the margin of error E (or EBP) that corresponds to the given statistics and confidence level. Round the margin of error to four decimal places. 95% confidence, n= 320, X = 60

Use the given data to find the minimum sample size required to estimate the population proportion.

a. Margin of error: 0.004; confidence level: 95%; p and q unknown.
b. Margin of error: 0,009; confidence level: 99%; P and unknown
c. Margin of error: 0.01; confidence level: 95%; from a prior study, p is estimated by the decimal equivalent of 52%