18. New car sales for a dealer in Cook County, Illinois, for the past year are shown in the followingtable, along with monthly indexes (seasonal relatives), which are supplied to the dealer by theregional distributor.MonthJan.Feb.Mar.Apr.May.Jun.Jul.Aug.Sept.Oct.Nov.Dec.Units Sold640648630761735850765805840828840800Index0.800.800.700.940.891.000.901.151.201.201.251.25a. 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 twographs.d. Assuming no proactive approach on the part of management, discuss (no calculations neces-sary) how you would forecast sales for the first three months of the next year.e. What action might management consider based on your findings in part b?

NOTE: We are allowed to do first three sub-parts only. Deseasonalized sales forecast is a method of…

Answered: a. Plot the data. Does there seem to be…

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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17 Gradual upward or downward movement of data over time is called: Select one: a. a trend. b. seasonality. c. exponential variation. d. a cycle. e. random variation.
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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.