Calculate the mean absolute deviation (MAD), the mean squared error (MSE), the mean absolute percentage error (MAPE), and the mean percentage error (MPE) for the following data Use Excel for this question copy and paste your work and answer from Excel worksheet Period Actual Forecasted

period actual forecast

1 217 215

2 213 216

3 216 215

4 210 214

5. 213 211

6. 219 214

7 216 217

8. 212. 216