The topics of Correlation and Product Moment Correlation Coefficient (PMCC) are related. They both concern scatter graphs. You will have seen simple scatter graphs of, say, people’s height plotted against their weight or the value of a car plotted against its age.
Scatter Graphs and Correlation
In Figure 6-1 we see that, in general, as people get taller they get heavier and that as a car gets older its value decreases.
Figure 6-1
Correlation scatter graphs
The first of the two graphs shows that as the x value rises, the ...
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