Question

Please post answers in excel showing all formulas used.

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

Week	Sales (1000s of gallons)
1	18
2	21
3	19
4	22
5	18
6	16
7	20
8	19
9	23
10	19
11	16
12	22

1. 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	18
   2	21
   3	19
   4	22
   5	18
   6	16
   7	20
   8	19
   9	23
   10	19
   11	16
   12	22

2. 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 =
   
3. 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 9.
   
   

Answer 1