Question

# Refer to the gasoline sales time series data in the given table. Week Sales (1,000s of...

Refer to the gasoline sales time series data in the given table.

 Week Sales (1,000s of gallons) 1 16 2 22 3 17 4 23 5 15 6 17 7 21 8 19 9 20 10 18 11 15 12 23
(a) Compute four-week and five-week moving averages for the time series.
If required, round your answers to two decimal places.
 Week Sales 4 Period Moving Average 5 period Moving Average 1 16 2 22 3 17 4 23 5 15 6 17 7 21 8 19 9 20 10 18 11 15 12 23
(b) Compute the MSE for the four-week and five-week moving average forecasts.
If required, round your final answers to three decimal places.
MSE for four-week moving average =
MSE for five-week moving average =
(c) What appears to be the best number of weeks of past data (three, four, or five) to use in the moving average computation? Consider that the MSE for the three-week moving average is 12.667.

MSE for 4 week movig avereage = 46.88/8=5.86

4 week and 5 week mse is better because mse is less than the mse in 3 week

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