A company manufacturing cds is working on a new technology. A random sample of 718 internet users were asked: "as you may know, some cd's are being manufactured so that you can only make one copy of the CD after you purchase it. Would you buy a CD with this technology, or would you refuse to buy it even if it was one you would normally buy?" Of these users, 62% responded that they would buy the CD.
A) Create a 95% confidence interval for this percentage?
B) If the companuy wants to cut the margin of error in half, how many users they must survey?