Passenger miles flown on Northeast Airlines, a commuter firm serving the Boston hub, are shown for the past 12 weeks 1912 a) Assuming an initial forecast for week 1 of 15,000 miles, use exponential smoothing to compute miles for weeks 2 through 12 Use a=0.22 (round your responses to two decmal places) b) The MAD for this model = thousand (round your response to two decimai places) c) Compute the Cumulative Forecast Errors, cumulative MAD in thousands, and tracking signals (round your responses to fwo decima places) Are the tracking signals within acceptable limits? The control limits for the tracking signal are set at \pm 3 MADs. The tracking signals acceptable imits