A response variable measures an outcome of a study. An explanatory variable may explain or
influence changes in a response variable.
Scatterplot: A plot that displays the relationship between two
quantitative
variables measured on
the same individuals. If one of the variables is an explanatory variable, it should be represented
on the horizontal axis (x axis).
A scatterplot shows the relationship between two quantitative variables measured on the same
individuals. The values of one variable appear on the horizontal axis, and the values of the other
variable appear on the vertical axis. Each individual in the data appears as the point in the plot
fixed by the values of both variables for that individual.
Always plot the explanatory variable, if there is one, on the horizontal axis (the x axis) of a
scatterplot. As a reminder, we usually call the explanatory variable x and the response variable y.
If there is no explanatoryresponse distinction, either variable can go on the horizontal axis.
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 Winter '11
 PattiColling
 René Descartes, Euclidean geometry

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