please help asap !!!!

A sample of size n 99 is drawn from a population whose standard deviation is a = 18 Part 1 of 2 (a) Find the margin of error for a 99% confidence interval for u. Round the answer to at least three decimal places The margin of error for a 99% confidence interval for us Part 2 of 2 (6) If the confidence level were 90% would the margin of error be larger or smaller? (Choose one) Y because the confidence levels (Choose one)