Question

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

Week	Sales (1,000s of gallons)
1	18
2	22
3	15
4	24
5	18
6	15
7	21
8	19
9	21
10	20
11	16
12	22

(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 18 2 22 3 15 4 24 5 18 6 15 7 21 8 19 9 21 10 20 11 16 12 22
(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 10.086.
	- Select your answer -ThreeFourFiveItem 18

Answer 1