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Scatter Diagram
•  Plots one variable against another
•  One of the simplest tools for visualizaHon
ž 
Example: Maintenance cost and Age
for nine buses (Spokane Transit)

ž 
This is an example of cross-secHonal
data (observaHons collected in a single
point of Hme)

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Cost
859
682
471
708
1094
224
320
651
1049
Age
8
5
3
9
11
2
1
8
12