Presentation of Quantitative Data

Bar charts

Used to represent data which is divided into categories (discrete data) e.g. yes or no

Line graphs

Used to represent data in numerical form (continuous data) e.g. the age of a person


Represent continuous data. Bars represent each score rather than a point. Bars are drawn touching to show that data is continuous. They are useful when there is a large range of data. Each group of scores is known as a class interval


Used to represent relationships between variables. Both variables need to be measured using a numerical scale. One variable is represented on x axis, and the other on y axis