The manager of a travel agency has been using a seasonally adjusted forecast to predict demand for packaged tours. The actual and predicted values are as follows:
a. Compute MAD for the fifth period, then update it period by period using exponential smoothing with ? = .3.
b. Compute a tracking signal for periods 5 through 14 using the initial and updated MADs. If limits of ? 4 are used, what can you conclude?