1. Here is a series of weekly demand data, covering 8 weeks, that the Forever Young Cos- metic Company collected on one of its products and forecasts for the corresponding weeks, made by forecast model 1, which the cosmetic company is testing.

a. Compute the mean absolute deviation based on all 8 weeks of data.

b. Compute the mean squared error based on these 8 weeks of data.

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WEEK DEMAND FORECAST 1 218 240 2345678 275 245 244 250 262 255 271 260 273 265 261 270 236 275