You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 90%. You would like to be 95% confident that your...

You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately 90%. You would like to be 95% confident that your estimate is within 3.5% of the true population proportion. How large of a sample size is required?