Business
Operations ManagementPractical Management ScienceConfederate Express is attempting to determine how its monthly shipping costs depend on the number of units shipped during a month. The file P13_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? ( Hint : Use a dummy variable.)Confederate Express is attempting to determine how its monthly shipping costs depend on the number of units shipped during a month. The file P13_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? ( Hint : Use a dummy variable.)
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Practical Management Science
6th Edition
WINSTON + 1 other
Publisher: Cengage,
ISBN: 9781337406659
BuyFindlaunch
Practical Management Science
6th Edition
WINSTON + 1 other
Publisher: Cengage,
ISBN: 9781337406659
Chapter 13, Problem 46P
Textbook Problem
Confederate Express is attempting to determine how its monthly shipping costs depend on the number of units shipped during a month. The file P13_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? (Hint: Use a dummy variable.)
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Practical Management Science
Ch. 13.3 - The file P13_01.xlsx contains the monthly number...Ch. 13.3 - The file P13_02.xlsx contains five years of...Ch. 13.3 - The file P13_03.xlsx contains monthly data on...Ch. 13.3 - The file P13_04.xlsx lists the monthly sales for a...Ch. 13.3 - Management of a home appliance store wants to...Ch. 13.3 - Do the sales prices of houses in a given community...Ch. 13.3 - The file P13_07.xlsx contains monthly values of...Ch. 13.3 - The management of a technology company is trying...Ch. 13.3 - We have discussed linear and exponential trend...Ch. 13.3 - Sometimes curvature in a scatterplot can be fit...
Ch. 13.4 - Suppose you are an analyst for a company that...Ch. 13.4 - A trucking company wants to predict the yearly...Ch. 13.4 - An antique collector believes that the price...Ch. 13.4 - Stock market analysts are continually looking for...Ch. 13.4 - Suppose that a regional express delivery service...Ch. 13.4 - The owner of a restaurant in Bloomington, Indiana,...Ch. 13.6 - The file P13_19.xlsx contains the weekly sales of...Ch. 13.6 - The file P13_20.xlsx contains the monthly sales of...Ch. 13.6 - The file P13_21.xlsx contains the weekly sales of...Ch. 13.6 - The file P13_22.xlsx contains total monthly U.S....Ch. 13.7 - You have been assigned to forecast the number of...Ch. 13.7 - Simple exponential smoothing with = 0.3 is being...Ch. 13.7 - The file P13_25.xlsx contains the quarterly...Ch. 13.7 - The file P13_26.xlsx contains the monthly number...Ch. 13.7 - The file P13_27.xlsx contains yearly data on the...Ch. 13.7 - The file P13_28.xlsx contains monthly retail sales...Ch. 13.7 - The file P13_29.xlsx contains monthly time series...Ch. 13.7 - A version of simple exponential smoothing can be...Ch. 13 - Many companies manufacture products that are at...Ch. 13 - A power company located in southern Alabama wants...Ch. 13 - Management of a home appliance store would like to...Ch. 13 - A small computer chip manufacturer wants to...Ch. 13 - The file P13_35.xlsx contains the amount of money...Ch. 13 - When potential workers apply for a job that...Ch. 13 - Callaway Golf is trying to determine how the price...Ch. 13 - Let Yt be the sales during month t (in thousands...Ch. 13 - The Baker Company wants to develop a budget to...Ch. 13 - The auditor of Kiely Manufacturing is concerned...Ch. 13 - The file P13_42.xlsx contains monthly data on...Ch. 13 - The belief that larger majorities for an incumbent...Ch. 13 - The auditor of Kaefer Manufacturing uses...Ch. 13 - (Based on an actual court case in Philadelphia.)...Ch. 13 - Confederate Express is attempting to determine how...Ch. 13 - Pernavik Dairy produces and sells a wide range of...
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