farming cooperative manager wants to estimate quarterly relatives for grain shipments, based on the data shown (quantities are in metric tons):
QUARTER
Year 1 2 3 4
1 200 250 210 340
2 210 252 212 360
3 215 260 220 358
4 225 272 233 372
5 232 284 240 381
Determine quarter relatives. (Hint: Use a centered four-period moving average initially, and then use a centered two-period moving average of the four-period moving average.)