A particular forecasting model was used to forecast a six-month period. Here are the forecasts and actual demands that resulted: ACTUAL 195 FORECAST April 244 May 318 254 June 393 338 July August September 343 296 368 334 443 403 a. Find the tracking signal for each month. (Negative values should be indicated by a minus sign. Round your answers to the nearest whole number.) Month Tracking Signal April May June July August September b. Does the model used here give acceptable answers? No, the model's performance is poor. Yes, the model's performance is good.