Scatterplots are useful because they show the relationship between two variables. The degree to which the plotted points are grouped together gives us insight into the correlation between these variables as well. A group of points can either be positively correlated, negatively correlated, or uncorrelated. These different classifications can also have different degrees or correlation as well.
The above scatter plot shows a splay of data points that plot the age of the husband against the age of the wife. In this scatterplot, there is an obvious, strong, positive correlation between the two ages.
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