File.php/811239/mod_resource/content/1/Ph17-Heizer-OptMgt12e.pdf Sy2 = 112 + 62 + 102 + 62 + 122 = 121 + 36 + 100 + 36 + 144 = 437 = 90 The next step is to find the coefficient of correlation, r: Thus, 2 = (.901 variability in sa with advertising Problems Note: Px means the problem may be solved with POM for Windows Problems 4.1-4.42 relate to Time-Series Forecasting 4.1 The following gives the number of pints of type B blood used at Woodlawn Hospital in the past 6 weeks: b) Use a 3-week and.6, using the week of c) Compute the smoothing wi . WEEK OF PINTS USED 360 . . 4.2 YEAR 1 389 410 DEMAND 7 August 31 September 7 September 14 September 21 September 28 October 5 381 368 374 a) Plot the abc cycles, or ra b) Starting in y a 3-year moy as the origin a) Forecast the demand for the week of October 12 using a 3-week moving average. b) Use a 3-week weighted moving average, with weights of 1,.3, and.6, using .6 for the most recent week. Forecast demand for the week of October 12. c) Compute the forecast for the week of October 12 using exponential smoothing with a forecast for August 31 of 360 and a = 2. PX 4.2