Question: A manager has just received an evaluation from an analyst on two potential forecasting methods. The analyst is indifferent between the two methods, saying that

A manager has just received an evaluation from an analyst on two potential forecasting methods. The analyst is indifferent between the two methods, saying that they should be equally accurate and in control. The demand and the forecasts using the two methods for nine periods follow:

a. Calculate the MSE for each method and compare the two methods.
b. Construct a 2s control chart for each method and interpret them. Do you agree with the analyst? Explain.

Period Demand: Method 1 Mathod 2 36 37 37 40 38 4 39 42 38 49 46 52 37 39 38 45 46 41 49 48 48 51 52 52 36 46

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