Answered: 160 Variable3 160 Variable3 140 140 -…

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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(d)

Figure 2.85(a) shows the same scatterplot with a third variable included. Is the new variable categorical or quantitative? If categorical, how many categories? If quantitative, estimate the range.

In Figure 2.85(a), if we only consider cases in Group A, does the association between Variable1 and Variable2 appear to be positive or negative? How about in Group B? Group C? Group D?

(f)

Figure 2.85(b) shows the same scatterplot as Figure 2.85(a) with regression lines added within each of the four groups. Does the regression line for Group A show a positive or negative association? How about Group B? Group C? Group D?

(g)

What happens to the direction of association shown in Figure 2.84 when we add the additional information contained in Variable3 as in Figure 2.85? (This is an example of Simpson's Paradox for quantitative variables.)

160
Variable3
160
Variable3
140
140 -
120
120 -
100 -
100-
80
80-
60
60
15
20
25
Variable1
(a)
30
20
Variable1
(b)
25
30
15
Variable2
ABCD
Variable2

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