Freight car loadings over an 18-week period at a busy port are as follows: Week Number Week
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Question:
Freight car loadings over an 18-week period at a busy port are as follows:
Week | Number | Week | Number | Week | Number |
1 | 260 | 7 | 325 | 13 | 405 |
2 | 265 | 8 | 345 | 14 | 410 |
3 | 270 | 9 | 365 | 15 | 460 |
4 | 265 | 10 | 360 | 16 | 465 |
5 | 270 | 11 | 380 | 17 | 470 |
6 | 275 | 12 | 400 | 18 | 475 |
a. Determine a linear trend line for expected freight car loadings.
Y ˆ Y^ = + t
b. Use the above trend equation to predict expected loadings for Weeks 20 & 21.
The forecasted demand for Week 20 is and for Week 21 is .
c. The manager intends to install new equipment when the volume exceeds 840 loadings per week. Assuming the current trend continues, in which week (at the earliest) should the loading volume reach that level?
Related Book For
Understanding Basic Statistics
ISBN: 9781111827021
6th Edition
Authors: Charles Henry Brase, Corrinne Pellillo Brase
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