Question: Please help me out and if possible please give me an explanation on how to do the control chart. I really appreciate for your help!!!

Please help me out and if possible please give me an explanation on how to do the control chart. I really appreciate for your help!!!

Joe Brown, an analyst for Elma Bakery, shared daily corn muffin sales and his forecasts for days 1 to 12 with you as given in the table below. Using the data in the table given below, answer the following questions:

Day 1 2 3 4 5 6 7 8 9 10 11 12
Sales 30 32 23 21 20 24 26 27 30 30 32 35
Joe's Forecast 31 29 16 25 25 18 31 25 27 40 28 34

Part I: Build a control chart to monitor Joe Browns forecast errors for days 1 to 12 (use 3 standard deviation control limits). Plot the forecast errors on the control chart you build.

Part II: : Using the control chart you plot in part (I), discuss whether Joes forecast errors are in control or not.

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