The above graph
is an example of a scatterplot. A scatterplot is a type of mathematical diagram
to display values for two variables for a set of data. The data is displayed as
a collection of points, each having the value of one variable determining the
position on the horizontal axis and the value of the other variable determining
the position on the vertical axis. A scatterplot is used when a variable exists
that is under control of the experimenter. This scatterplot displays the
correlation between a wife’s age and a husband’s age.
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