a - Find the equation of the general trend line using the ordinary least squares method? Then predict the value of sales in 2012. b - Draw the general trend line by moving averages (the length of the cycle Three years).

Practical Management Science
6th Edition
ISBN:9781337406659
Author:WINSTON, Wayne L.
Publisher:WINSTON, Wayne L.
Chapter13: Regression And Forecasting Models
Section13.6: Moving Averages Models
Problem 22P: The file P13_22.xlsx contains total monthly U.S. retail sales data. While holding out the final six...
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Q3: The following data represent the sales of Noor Al-Ahlia Company for the period from 2006-2011:
2010 2009 2008 2007 2006
18
the year
2011
20
13
8
4
2
the sales
a - Find the equation of the general trend line using the ordinary least
squares method? Then predict the value of sales in 2012.
b - Draw the general trend line by moving averages (the length of the cycle
Three years).
Transcribed Image Text:Q3: The following data represent the sales of Noor Al-Ahlia Company for the period from 2006-2011: 2010 2009 2008 2007 2006 18 the year 2011 20 13 8 4 2 the sales a - Find the equation of the general trend line using the ordinary least squares method? Then predict the value of sales in 2012. b - Draw the general trend line by moving averages (the length of the cycle Three years).
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