Problem 3-19 (Algo) Harlen Industries has a simple forecasting model: Take the actual demand for the same month last year and divid by the number of fractional weeks in that month. This gives the average weekly demand for that month. This wee average is used as the weekly forecast for the same month this year. This technique was used to forecast eight w for this year, which are shown below along with the actual demand that occurred. The following eight weeks show the forecast (based on last year) and the demand that actually occurred: WEEK 1 2 3 4 5 6 7 8 FORECAST DEMAND 130 132 140 140 130 140 155 165 ACTUAL DEMAND 127 123 145 155 175 165 180 200 a. Compute the MAD of forecast errors. (Round your answers to 2 decimal places.) MAD Week 1 2 3 4 5 6 7 8 b. Using the RSFE, compute the tracking signal. (Round your answers to 2 decimal places. Negative values should be indicated by a minus sign.) Week Tracking Signal 1 2 3 4 5 6 7 8 c. Based on your answers to parts a and b, comment on Harlen's method of forecasting. The forecast should be considered poor. The forecast should be considered good