dr.susan.carroll@snet.net

Scattergram: dissertation research questions about relationships

Scattergrams can tell you the strength of the relationship between the two variables.

* If the dots cluster close to an imaginary line, there is a very strong relationship or correlation between the two variables.

* When the dots are scattered in an ellipse or cigar-shape, there is a moderate correlation.

* When the dots are scattered randomly around the graph, there is a low or negligible correlation.

Scattergrams can tell us the direction of the relationship between the two variables.

* If the slope of the line falls from left to right, there is a negative correlation.

* If the slope of the line rises from left to right, there is a positive correlation.

Scattergrams form the shape of a cigar if there is a positive or negative strong correlation between the two variables you are studying. The further away from an elliptical shape, the weaker the correlation. It is a quick snapshot picture of the relationship between the two variables.

Return from scattergram to statistical tests.