Question: Confederate Express is attempting to determine how its monthly shipping costs depend on the number of units shipped during a month. The file P14_46.xlsx contains

Confederate Express is attempting to determine how its monthly shipping costs depend on the number of units shipped during a month. The file P14_46.xlsx contains the number of units shipped and total shipping costs for the past 15 months.

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. Suppose there was a trucking strike during months 11 to 15, and we believe that this might have influenced shipping costs. How could the answer to 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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Month Units Cost Strike 1 300 10600 0 2 400 13800 0 3 500 16400 0 4 200 7400 0 5 300 10600 0 6 350 11900 0 7 460 15200 0 8 480 15800 0 9 120 5400 0 10 ... View full answer

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