Confederate Express is attempting to determine how its monthly shipping costs depend on the number of units
Question:
a. Use regression to determine a relationship between units shipped and monthly shipping costs.
b. Plot the errors for the predictions in order of time sequence. Is there any unusual pattern?
c. You have now been told that there was a trucking strike during months 11 through 15, and you believe that this might have influenced shipping costs. How can the analysis in part a be modified to account for the effects of the strike? After accounting for the effects of the strike, does the unusual pattern in part b disappear?
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Related Book For
Data Analysis and Decision Making
ISBN: 978-0538476126
4th edition
Authors: Christian Albright, Wayne Winston, Christopher Zappe
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