(a) compute four-week and five-week moving averages for the time series. week time series value 4-week moving average forecast 5-week moving average forecast 1 17 2 22 3 20 4 24 5 18 incorrect: your answer is incorrect. 6 17 incorrect: your answer is incorrect. 7 21 8 19 9 22 10 21 11 15 12 23 (b) compute the mse for the four-week moving average forecasts. (round your answer to two decimal places.) 11.51 incorrect: your answer is incorrect. compute the mse for the five-week moving average forecasts. (round your answer to two decimal places.) 8.59 incorrect: your answer is incorrect. (c) what appears to be the best number of weeks of past data (three, four, or five) to use in the moving average computation? the mse for the three-week moving average is 11.64. three weeks appears to be best, because the three-week moving average provides the smallest mse. three weeks appears to be best, because the three-week moving average provides the largest mse. four weeks appears to be best, because the four-week moving average provides the smallest mse. five weeks appears to be best, because the five-week moving average provides the smallest mse. none appear better than the others, because they all provide the same mse. correct: your answer is correct.