This scatter diagram shows the age of a car and its value. This graph is an example of a negative correlation. As the age of a car increases, its value decreases.

Video Transcript Line graphs Line graphs are used to show continuous changes over time. A line graph might be useful for showing the pattern of change in world population, for example.

Here is a scatter plot showing a positive correlation between study time and test scores. The graph shows that the more one studies (X-axis), the higher one will score on a test (Y-axis).