Answered: Problem 13 page 552 A BMW car dealer in…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Problem 13 page 552
A BMW car dealer in Sicilia, Italy, has the following
monthly new car sales data for January through
December 2014. The dealer believes that new car sales
follow a monthly seasonal pattern and computed the
seasonal indices for each of the 12 months, which are
also given in the following table.
Month New Car
Sales
Seasonal
Indices
1 720 0.85
2 742 0.85
3 695 0.65
4 798 0.9
5 740 0.85
6 830 1
7 785 0.96
8 900 1.2
9 990 1.3
10 920 1.3
11 890 1.35
12 840 1.35
a Plot the car sales data. Does there appear to be a trend?
b. Deseasonalize the actual car sales to isolate the trend
component.
c Develop a linear trend equation using the
desasonalized data.
d Develop a trend forecast for January and February
2015
e. Develop a seasonalized forecast for January and
February 2015.

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