CAS Exam MAS-I Spring 2019, Question 41
Study guide: Exam MAS-II
The time series below shows study manuals sold by month by company XYZ:
| t | Month | Year | Study Manuals Sold |
|---|---|---|---|
| 1 | Jan | 2016 | 52 |
| 2 | Feb | 2016 | 18 |
| 3 | Mar | 2016 | 16 |
| 4 | Apr | 2016 | 14 |
| 5 | May | 2016 | 16 |
| 6 | Jun | 2016 | 16 |
| 7 | Jul | 2016 | 18 |
| 8 | Aug | 2016 | 50 |
| 9 | Sep | 2016 | 20 |
| 10 | Oct | 2016 | 16 |
| 11 | Nov | 2016 | 18 |
| 12 | Dec | 2016 | 20 |
| 13 | Jan | 2017 | 60 |
| 14 | Feb | 2017 | 22 |
| 15 | Mar | 2017 | 17 |
| 16 | Apr | 2017 | 19 |
| 17 | May | 2017 | 21 |
| 18 | Jun | 2017 | 23 |
| 19 | Jul | 2017 | 25 |
| 20 | Aug | 2017 | 60 |
| 21 | Sep | 2017 | 28 |
| 22 | Oct | 2017 | 22 |
| 23 | Nov | 2017 | 24 |
| 24 | Dec | 2017 | 28 |
Calculate the monthly additive effect at time t = 13 using the centering approach.
- A) Less than 25
- B) At least 25, but less than 30
- C) At least 30, but less than 35
- D) At least 35, but less than 40
- E) At least 40
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