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.) b. Does the model used here give acceptable answers? No, the model's performance is poor. Yes, the model's performance is good. 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.) b. Does the model used here give acceptable answers? No, the model's performance is poor. Yes, the model's performance is good