### Home > CCA > Chapter 4 > Lesson 4.2.1 > Problem 4-36

Taken from the Lesson 4.2.1 Math Notes box:

An association (relationship) between two numerical variables can be described by its form,

direction, strength, and outliers.

The shape of the pattern is called the form of the association: linear or nonlinear.

The form can be made of clusters of data.

If one variable increases as the other variable increases, the direction is said to be a positive

association. If one variable increases as the other variable decreases, there is said to be a

negative association. If there is no apparent pattern in the scatterplot, then the variables

have no association.

A very strong positive non-linear association with no apparent outliers.