The Scatter Diagram

Firstly for the regression we use the scatter diagram for the studying the relationship between two variables. It study the relationship between the two variables.

Example:-

In the above example, the points are plotted by assigning values of the independent variable X to the horizontal axis and values of the dependent variable Y to the vertical axis.
The pattern made by the points plotted on the scatter diagram usually suggest the basic nature and strength of the relationship between two variables. The scatter diagram also shows that, subjects with large waist circumferences also have larger amounts of deep abdominal AT. These impressions suggest that the relationship between the two variables may be described by a straight line crossing the Y-axis below the origin and making approximately a 45-degree angle with the X-axis.