Week Forecast Forecast Error 1 2 3 4 5 Patient Arrivals 400 380 411 Reconsider the patient arrival data in Example 14.3. It is now the end of week 3 so the actual arrivals is known to be 411 patients. Using a = 0.10, calculate the exponential smoothing forecast for week 4. What was the forecast error for week 4 If the actual demand turned out to be 4157 What is the forecast for week 57