8.2.9-1 Question Help Banking fees have received much attention during the recent economic recession as banks look for ways to recover from the crisis. A sample of 32 customers paid an average fee of $12.23 per month on their interest-bearing checking accounts. Assume the population standard deviation is $1.58. Complete parts a and b below. a. Construct a 95% confidence interval to estimate the average fee for the population. The 95% confidence interval has a lower limit of $ | and an upper limit of $. (Round to the nearest cent as needed.)