Freight car loadings over an 18-week period at a busy port are as follows:   Week Number Week Number Week Number 1 410 7 460 13 540 2 420 8 480 14 550 3 430 9 500 15 570 4 420 10 490 16 580 5 430 11 510 17 590 6 440 12 530 18 600     Click here for the Excel Data File   a. Determine a linear trend line for expected freight car loadings. (Round your intermediate calculations and final answers to 2 decimal places.)       b. Use the above trend equation to predict expected loadings for Weeks 20 & 21. (Round your final answers to 2 decimal places.)       c. The manager intends to install new equipment when the volume exceeds 990 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.

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter9: Decision Making Under Uncertainty
Section: Chapter Questions
Problem 46P
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Freight car loadings over an 18-week period at a busy port are as follows:
 

Week Number Week Number Week Number
1 410 7 460 13 540
2 420 8 480 14 550
3 430 9 500 15 570
4 420 10 490 16 580
5 430 11 510 17 590
6 440 12 530 18 600
 

 

Click here for the Excel Data File

 

a. Determine a linear trend line for expected freight car loadings. (Round your intermediate calculations and final answers to 2 decimal places.)
 

 

 

b. Use the above trend equation to predict expected loadings for Weeks 20 & 21. (Round your final answers to 2 decimal places.)
 

 


 
c. The manager intends to install new equipment when the volume exceeds 990 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.)
 

 
 
 
 
 
 
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