In: Math
Corporate triple A bond interest rates for 12 consecutive months are as follows: 9.7 9.4 9.6 9.8 9.6 9.9 9.9 10.5 9.8 9.5 9.4 9.4 If required, round your answer to two decimal places. (a) Choose the correct time series plot. (i) (ii) (iii) (iv) What type of pattern exists in the data? (b) Develop three-month and four-month moving averages for this time series. If required, round your answers to two decimal places. Week Sales 3 Month Moving Average 4 Month Moving Average 1 9.7 2 9.4 3 9.6 4 9.8 5 9.6 6 9.9 7 9.9 8 10.5 9 9.8 10 9.5 11 9.4 12 9.4 3-month moving average 4-month moving average MSE Does the three-month or the four-month moving average provide the better forecasts based on MSE? Explain. (c) What is the moving average forecast for the next month?
a)
t | r | 3 MONTH MA | 4 mont MA | error ^2 in 3 month | error^2 in 4 month | |
1 | 9.7 | |||||
2 | 9.4 | |||||
3 | 9.6 | |||||
4 | 9.8 | 9.566666667 | 0.054444444 | |||
5 | 9.6 | 9.6 | 9.625 | 0 | 0.000625 | |
6 | 9.9 | 9.666666667 | 9.6 | 0.054444444 | 0.09 | |
7 | 9.9 | 9.766666667 | 9.725 | 0.017777778 | 0.030625 | |
8 | 10.5 | 9.8 | 9.8 | 0.49 | 0.49 | |
9 | 9.8 | 10.1 | 9.975 | 0.09 | 0.030625 | |
10 | 9.5 | 10.06666667 | 10.025 | 0.321111111 | 0.275625 | |
11 | 9.4 | 9.933333333 | 9.925 | 0.284444444 | 0.275625 | |
12 | 9.4 | 9.566666667 | 9.8 | 0.027777778 | 0.16 | |
MSE | 0.148888889 | 0.169140625 | ||||
t | r | 3 MONTH MA | 4 mont MA | error ^2 in 3 month | error^2 in 4 month | |
1 | 9.7 | |||||
=1+A2 | 9.4 | |||||
=1+A3 | 9.6 | |||||
=1+A4 | 9.8 | =AVERAGE(B2:B4) | =(B5-C5)^2 | |||
=1+A5 | 9.6 | =AVERAGE(B3:B5) | =AVERAGE(B2:B5) | =(B6-C6)^2 | =(B6-D6)^2 | |
=1+A6 | 9.9 | =AVERAGE(B4:B6) | =AVERAGE(B3:B6) | =(B7-C7)^2 | =(B7-D7)^2 | |
=1+A7 | 9.9 | =AVERAGE(B5:B7) | =AVERAGE(B4:B7) | =(B8-C8)^2 | =(B8-D8)^2 | |
=1+A8 | 10.5 | =AVERAGE(B6:B8) | =AVERAGE(B5:B8) | =(B9-C9)^2 | =(B9-D9)^2 | |
=1+A9 | 9.8 | =AVERAGE(B7:B9) | =AVERAGE(B6:B9) | =(B10-C10)^2 | =(B10-D10)^2 | |
=1+A10 | 9.5 | =AVERAGE(B8:B10) | =AVERAGE(B7:B10) | =(B11-C11)^2 | =(B11-D11)^2 | |
=1+A11 | 9.4 | =AVERAGE(B9:B11) | =AVERAGE(B8:B11) | =(B12-C12)^2 | =(B12-D12)^2 | |
=1+A12 | 9.4 | =AVERAGE(B10:B12) | =AVERAGE(B9:B12) | =(B13-C13)^2 | =(B13-D13)^2 | |
MSE | =AVERAGE(F5:F13) | =AVERAGE(G6:G13) | ||||
b)
MSE for 3-mont h average is less than 4-month MSE
c)
MA for next month | forecast |
3 | 9.433333 |
4 | 9.525 |