Question

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

Week	Sales (1000s of gallons)
1	17
2	21
3	19
4	24
5	19
6	15
7	21
8	19
9	23
10	19
11	15
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	17
   2	21
   3	19
   4	24
   5	19
   6	15
   7	21
   8	19
   9	23
   10	19
   11	15
   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 14.34.
   
   

Answer 1