12th Edition

ISBN: 9780135240687

Author: Lial

Publisher: PEARSON

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Textbook Question

Chapter 2.3, Problem 11E

In each of the next two problems, two linear models are given for the data. For each model,

a. find the residuals and their sum;

b. find the sum of the squares of the residuals;

c. decide which model is the better fit. (See Example 2)

Cisco Sales The following table shows the estimated sales (inbillions of dollars) in China for CiscoSystems, Inc. for several years.

Year	2006	2008	2010	2012	2014
Sales	.7	1.22	1.53	2.02	1.81

Leta[&x=6&] correspond to the year 2006. Two equations that modelthese data are [&y=.07x+83&] and [&y=.2x-.38&] (Data from: TheWall Street Journal.)

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Chapter 2.3, Problem 10E

Chapter 2.3, Problem 12E

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Solution Summary: The author calculates the residuals and their sum for the provided model y=.07x+83, and the data is given as,

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