The postmaster of a small western town receives a certain number of complaints each day about mail delivery. DAY 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Number of complaints 4 11 15 8 9 6 5 14 14 7 6 4 2 9 Click here for the Excel Data File a. Determine two-sigma control limits using the above data. (Round your intermediate calculations to 4 decimal places
