PLEASE HELP SOLVE PART A AND B

Problem 15-07 (Algorithmic) Refer to the gasoline sales time series data in the given table. Week Sales (1000s of gallons) 1 17 2 20 3 18 4 24 5 19 6 16 7 22 8 18 9 21 10 21 11 15 12 23 a. Compute four-week and five-week moving averages for the time series. Round your answers to two decimal places. 4-Week 5-Week Moving Average Moving Average Week Sales 1 17 2 20 3 3 18 a. Compute four-week and five-week moving averages for the time series. Round your answers to two decimal places. 4-Week 5-Week Moving Average Moving Average Week Sales 1 17 2 20 3 18 4 4 24 5 19 1 X 6 16 20.5 x 19.8 x 7 22 19.25 19.6 x 8 18 1 x 9 21 18.25 X 19.4 X 10 21 18.75 X 18.60 x 11 15 20.25 X 19.20 x 12 23 19.25 x 19.4 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 =