Answered: 89 july 223 Feb 57 august 286 mar 144…

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

Observations of the demand for a certain part stocked at a parts supply depot during the calendar
year 2013 were:

Month	Demand	Month	Demand
Jan	89	july	223
Feb	57	august	286
mar	144	sept	212
april	221	oct	275
may	177	nov	188
june	280	dec	312

a) Using a four-month moving average, determine the one-step-ahead forecast for July
through December 2013.
b) Using a four-month moving average, determine the two-step-ahead forecast for July
through December 2013.
c) Obtain the MAD for the forecasts obtained in the above sections. Which method gave
better results? Based on forecasting theory, which method should have given better
results?

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