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

Week	Sales (1000s of gallons)
1	17
2	20
3	19
4	24
5	17
6	15
7	21
8	17
9	23
10	21
11	15
12	22

A. 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	20
3	19
4	24
5	17
6	15
7	21
8	17
9	23
10	21
11	15
12	22

B. 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 =