18. New car sales for a dealer in Cook County, Illinois, for the past year are shown in the following table, along with monthly indexes (seasonal relatives), which are supplied to the dealer by the regional distributor. Month Units Sold Index Jan. 640 0.80 Feb. 648 0.80 Mar. 630 0.70 Apr. 761 0.94 May. 735 0.89 Jun. 850 1.00 Jul. 765 0.90 Aug. 805 1.15 Sept. 840 1.20 Oct. 828 1.20 Nov. 840 1.25 Dec. 800 1.25 a. Plot the data. Does there seem to be a trend? b. Deseasonalize car sales. c. Plot the deseasonalized data on the same graph as the original data. Comment on the two graphs. d. Assuming no proactive approach on the part of management, discuss (no calculations neces- sary) how would forecast sales for the first three months of the next year. you e. What action might management consider based on your findings in part b?
18. New car sales for a dealer in Cook County, Illinois, for the past year are shown in the following table, along with monthly indexes (seasonal relatives), which are supplied to the dealer by the regional distributor. Month Units Sold Index Jan. 640 0.80 Feb. 648 0.80 Mar. 630 0.70 Apr. 761 0.94 May. 735 0.89 Jun. 850 1.00 Jul. 765 0.90 Aug. 805 1.15 Sept. 840 1.20 Oct. 828 1.20 Nov. 840 1.25 Dec. 800 1.25 a. Plot the data. Does there seem to be a trend? b. Deseasonalize car sales. c. Plot the deseasonalized data on the same graph as the original data. Comment on the two graphs. d. Assuming no proactive approach on the part of management, discuss (no calculations neces- sary) how would forecast sales for the first three months of the next year. you e. What action might management consider based on your findings in part b?
Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter2: Introduction To Spreadsheet Modeling
Section: Chapter Questions
Problem 20P: Julie James is opening a lemonade stand. She believes the fixed cost per week of running the stand...
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