Banking fees have received much attention during the recent economic recession as banks look for ways to recover from the crisis. A sample of

41 customers paid an average fee of $12.76 per month on their interest-bearing checking accounts. Assume the population standard deviation is $1.75.

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.)

b. What is the margin of error for this interval?