A confidence interval for a population proportion p is 0.635 to 0.700. What is the margin of error?

You plan to build a 95% confidence interval estimate of the mean of a large population. You want a margin of error no larger than +10. You estimate the population standard deviation to be 200. How large a sample is needed?

n = 360 and p = 0.09, find the margin of error at a 99% confidence level

if n = 42, p = 0.6 then construct the 98% confidence interval for the population proportion.