Question 8 2 points A manager has been using a certain technique to forecast demand for gallons of ice cream for the past six periods. Actual and forecasted amounts are shown below. Period Demand Forecast 1 90 87 2 85 88 3 91 87 4 92 89 5 95 90 6 88 92 What is the MAD for this forecasting technique? 2.54 None of the other choices are correct 4.54 4.25 3.67 What is the MSE for this forecasting technique? 14 13.46 16.8 None of the other choices are correct 3.74 What is the sigma (or standard deviation) for this forecasting technique? 2.067 4.099 1.099 3.074 If the errors are assumed to be normally distributed with CL=0, LCL-4.5 and UCL= +4.5, the errors None of the other choices are correct period 5 OOOOO period 6 period 3 period 3 and 6