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 $11.86 per month on their interest-bearing checking accounts. Assume the population standard deviation is $1.56. Complete parts a and b below. a. Construct a 90% confidence interval to estimate the average fee for the population. The 90% confidence interval has a lower limit of $, and an upper limit of $b. What is the margin of error for this interval?

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