Refer to the gasoline sales time series data in the given
table.
Week
Sales (1000s of gallons)
1
17
2
21
3
19
4
23
5
17
6
16
7
20
8
19
9
21
10
19
11
15
12
23
Compute four-week and five-week moving averages for the time
series. Round your answers to two decimal places.
Week
Sales
4-Week
Moving Average
5-Week
Moving Average
1
17
2
21
3
19
4
23
5
17
6
16
7
20
8
19
9
21
10
19
11
15
12
23
Compute the MSE for the four-week and five-week moving average
forecasts. Round your intermediate calculations and final answers
to two decimal places.
MSE for four-week moving average =
MSE for five-week moving average =
What appears to be the best number of weeks of past data (three,
four, or five) to use in the moving average computation? Recall
that MSE for the three-week moving average is 11.19.
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