Statistics » Scatter graph

Other names for scatter graph are scatter plot, scatterplot, scatter chart, scattergram or scatter diagram.

What is a scatter graph?

A scatter graph is a diagram in which you put values from a data set as dots in a coordinate system.

Example 1
In an inquiry 25 men are asked about their height and weight.
The answers are put in the scatter graph below.
You can read off that the shortest man is 160 cm tall and weighs 70 kg.
The heaviest man in this inquiry weighs 90 kg and is 188 cm tall.

You can see there is a correlation between the height and weight of men. In general the taller a man is, the heavier he weighs.

Example 2
In the same inquire these men were also asked about their monthly salary. This data resulted in the following scatter graph.

You can see there is no correlation between the height of a man and his monthly salary.