2.1 An important note about bar charts
When producing a bar chart to represent discrete data, the bars represent an exact number, and this is shown by separating them with gaps. Whereas, if the data to be presented is continuous, the bars represent grouped data and are positioned directly next to one another to show that one group directly borders the next with no true gap.
Figure 11 Bar charts representing discrete and continuous data
Interactive feature not available in single page view (see it in standard view).
Note that many graphs produced in textbooks or in the media are technically incorrect because this distinction of data type has not been made.
You will look more at representing data of different types in Weeks 4 and 5.