The following represents the actual demand and judgmental forecasts developed by two managers for the past 10 weeks.
Week 1 forecast demand 4500 actual demand 4000
Week 2 forecast demand 5000 actual demand 4200
Week 3 forecast demand 4000 actual demand 4200
Week 4 forecast demand 3800 actual demand 3000
Week 5 forecast demand 3600 actual demand 3800
Week 6 forecast demand 4000 actual demand 5000
Week 7 forecast demand 5000 actual demand 5600
Week 8 forecast demand 4800 actual demand 4400
Week 9 forecast demand 4000 actual demand 5000
Week 10 forecast demand 5000 actual demand 4800
Use the concept of a tracking signal to determine whether the judgemental forecasting system is performing satisfactorily.