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A) 22.50

B) 22.63

C) 22.45

D) 22.13

Measuring Errors and Selecting a Time-Series Method Absolute Percentage Error Week Demand Forecast Error Error Squared Absolute Error 9 3 1 225 228 -3 1.3% 2 188 227 -39 1521 39 20.7% 3 193 215 -22 484 22 11.4% 4 185 209 -24 576 24 13.0% 5 160 202 -42 1764 42 26.3% 6 213 189 24 576 24 11.3% 7 215 196 19 361 19 8.8% 8 203 202 1 1 1 0.5% 9 175 202 -27 729 27 15.4% 10 184 194 - 10 100 10 5.4% Total XXX E (X-X) 1. Calculate the standard deviation 0 n-1