Forecasts and actual sales of MP3 players at Just Say Music are as follows:

a. Plot the data and provide insights about the time series.
b. What is the forecast for November, using a two-period moving average?
c. What is the forecast for November, using a three-period moving average?
d. Compute MSE for the two- and three-period moving average models and compare your results.
e. Find the best number of periods for the moving average model based on MSE.

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Month March April May June July August September 270 October Forecast 150 220 205 256 250 260 Actual Sales 170 229 192 241 238 210 225 179 280