Corporate triple A bond interest rates for 12 consecutive months follow.
Month Bond Interest
1 9.5
2 9.3
3 9.4
4 9.6
5 9.8
6 9.7
7 9.8
8 10.5
9 9.9
10 9.7
11 9.6
12 9.6
a. Make three-month and four-month moving averages for this time series. Does the three-month or four month moving average provide the better forecast? Explain.
b. What is the moving average forecast for the next month?