## Correlation: The

Scatter Diagram

## The simplest way to reveal a possible correlation between bivariate data is to express it graphically. Let's use the example from the preceding page:

## x

## 24

## 15

## 17

## 32

## 19

## 18

## 25

## 34

## y

## 22

## 11

## 14

## 30

## 17

## 12

## 23

## 31

## Apparently there is a strong linear relationship with the points, one that follows an upward moving pattern. If we were to join the points with a line, it would possess a positive slope, representing a positive relationship. Other examples of scatter diagrams help illustrate relationships between points.

Scatter diagrams are helpful in that they do not require complex calculations. A more precise method of discovering a relationship is to make apply the linear correlation coefficient

Linear Correlation Coefficient

6:2