You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p∗=63%p∗=63%. You would like to be 99.5% confident...

You want to obtain a sample to estimate a population proportion. Based on previous evidence, you believe the population proportion is approximately p∗=63%p∗=63%. You would like to be 99.5% confident that your estimate is within 1% of the true population proportion. How large of a sample size is required?

the steps for the similiar question has .98 in the invNORM and i dont know where that number came from.