Correlation (theory)

1. CORRELATION

6. Positive Correlation
• Taller people have larger shoe sizes and shorter
people have smaller shoe sizes.
• The more money she saves, the more
financially secure she feels.
• As the temperature goes up, ice cream sales
also go up.

7. Negative Correlation
• A student who has many absences has a
decrease in grades.
• As weather gets colder, air conditioning costs
decrease.
• If a car decreases speed, travel time to a
destination increases.

13. Example
• You are analyzing accident patterns on a highway.
You select the two variables, motor speed and the
number of accidents, and draw the diagram.
• Once the diagram is complete, you notice that as
the speed of vehicles increases, the number of
accidents goes up. This shows the relationship
between the two.
• Since this diagram shows you the correlation
between the variables, many experts call it a
correlation chart.