8 Problem 18-18 (Algo) A particular forecasting model was used to forecast a six-month period. Here are the forecasts and actual demands that resulted: FORECAST ACTUAL April 258 208 May 334 244 June 409 329 July 359 308 August 384 328 September 459 403 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.)

a. Find the tracking signal for each month. (Negative values should be indicated by a minus sign. Round your answers to the hearest whole number.) b. Does the model used here give acceptable answers? No, the model's performance is poor. Yes, the model's performance is good