The two most important characteristics to examine in a scatter diagram are the number of possible categories for X and Y and the number of observations in each category.

Scatter Diagram

A graphical representation of data points to show the relationship between two variables, with one variable on each axis.

Categories

Groups or classes into which data or items are organized based on shared characteristics or properties.

Observations

The act of recording or the data recorded during an experiment or study, representing instances or examples of a phenomenon.