A particular forecasting model was used to forecast a six-month period. Here are the forecasts and actual demands that resulted: FORECAST ACTUAL April 256 232 May 330 300 June 406 460 July 355 433 August 380 490 September 456 514 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.)