please fill out a and b.

B's question is Compute the MSE for the four week and five week moving average for the times series. round your answer to two decimal places.

Problem 15-07 (Algorithmic) Refer to the gasoline sales time series data in the given table. Sales (1000s of gallons) Week 1 2 3 I 22 19 23 19 5T 16 21 19 10 23 19 14 12 22 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 17 22 19 WN 23 19 16 21 b. Compute the HSE 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 for five we moving average c. 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 HSE for the three week moving avereis 12.72