Interpreting Scatter Graphs

Relationships.

Scatter Graphs are an effective quick way of seeing if two variables (measures) have an effect upon each other.

e.g.  I think that the taller you are the heavier you will tend to be.  We can see if this relationship is evident if we take the measures of say 100 people and graph them.

Here are the results for the students in a class.  You can see that each person is represented by a cross (normally we use dots).  The tallest person is also the heaviest.


Line of Best Fit - can you see that there could be a straight line drawn into the graph over the points.  How closely can you see