Banking fees have received much attention during the recent economic recession as banks look for ways to recover from the crisis. A sample of 35 customers paid an average fee of $12.48 per month on their interest-bearin andard deviation is $1.54. Complete parts a and b below. a. Construct a 99% confidence interval to estimate the average fee for the population. The 99% confidence interval has a lower limit of $ ] and an upper limit of $. (Round to the nearest cent as needed.) b. What is the margin of error for this interval? $(Round to the nearest cent as needed.)