Given the series Yt in Table P-8:
a. What is the forecast for period 9, using a five-period moving average?
b. If simple exponential smoothing with a smoothing constant of .4 is used, what is the forecast for time period 4?
c. In part b, what is the forecast error for time period 3?
Table P-8

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Time Period Y 200 215 216 219