Problem 3-7
Freight car loadings over an 18-week period at a busy port are
as follows:
Week | Number | Week | Number | Week | Number |
1 | 370 | 7 | 415 | 13 | 450 |
2 | 380 | 8 | 425 | 14 | 455 |
3 | 390 | 9 | 435 | 15 | 475 |
4 | 380 | 10 | 425 | 16 | 485 |
5 | 390 | 11 | 435 | 17 | 495 |
6 | 395 | 12 | 445 | 18 | 505 |
a. Determine a linear trend line for expected freight car
loadings. (Round your intermediate calculations and final
answers to 2 decimal places.)
YˆY^ = + t
b. Use the above trend equation to predict
expected loadings for Weeks 20 & 21. (Round your final
answers to 2 decimal places.)
The forecasted demand for Week 20 is
and for
Week 21 is
.
c. The manager intends to install new equipment
when the volume exceeds 950 loadings per week. Assuming the current
trend continues, in which week (at the earliest) should the loading
volume reach that level? (Use the rounded answers, as
required, from any previous part of this problem. Do not round any
other intermediate calculations. Round your final answer to 2
decimal places.)
It should reach 950 loadings in Week .
Problem 3-7 Freight car loadings over an 18-week period at a busy port are as follows:...
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