Answered: Coal Production in the United States…

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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Question

A company that manufactures shuttle cars and mines for the coal mining industry has determined that “coal production in the U.S.” is a fairly reliable
three-quarter leading indicator of their sales. This quarter’s coal production in the United States can be obtained from the Department of Energy and it is used to obtain a forecast of their shuttle car and miner sales nine months from now. For the data below, determine a linear equation based on regression analysis and prepare a forecast of company sales three quarters from now.

Coal Production in
the United States
Quarter t
Future Sales
(units/quarter)
Yt+3
(103 tons/quarter) ×†
1
341
173
2
355
147
3
248
106
4
406
184
5
421
233
375
169

7
341
210
8
267
121
9
289
118
10
489
271
11 (now)
?
198

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