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Percentages

For the Hawkins Company, the monthly percentages of all shipments that were received on time over the past 12 months are 80, 82, 84, 83, 83, 84, 85, 84, 82, 83, 84, and 83.
a. Compare a three-month moving average forecast with an exponential smoothing forecast for α =0.2. Which provides the better forecasts?
b. What is the forecast for the next month?

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