A particular forecasting model was used to forecast a six-month period. Here are the forecasts and actual demands that resulted: PORECAST ACTUAL April 260 237 May 334 304 June 409 462 July 359 436 August 384 492 September 459 516 a. Find the tracking signal for each month. (Negative values should be indicated by a minus sign. Round your answers to the 2 decimal places.) Answer is complete but not entirely correct. Month Tracking Signal April (1.00) May (2.00) June 3.00 July 4.00 August 5.00 September 6.00