13. Using standard deviations for the values obtained in parts a, b, and c of problem 12, compare your results to the results of a Cumberland Company survey of its managers

concerning the accuracy of the company's forecasts (shown below). Expected Forecast Error for a Period of: 1 Month 1 Quarter 1 Year Level of Detail Total Volume Family Type in Family Grade in Type SKU *+12%. *NF no forecast. *Stockkeeping unit. 12* 15 15 30 8 10 NF+ NF 8 8 12 NF