Need Help- Sample Size Question

Question

Start of Questions

A political candidate has asked you to conduct a poll to determine what percentage of people support her.

If the candidate only wants a 8% margin of error at a 95% confidence level, what size of sample is needed?

The political candidate will need to sample ___  people.

Answer 1

sample size = 0.25 * (z-critical/0.08)^2, where z-critical corresponding to 95% confidence level is 1.96 = 150.0625, which means 151 people will be needed to be sampled.