Welcome to this deck on representing data. We'll explore how to read and understand different types of charts and graphs, which are powerful tools for telling stories with numbers. We will cover bar charts, pie charts, and scatter graphs, including the important idea of correlation.

A key skill in your exam is drawing these charts accurately. While we can learn the rules and concepts here, the physical act of drawing requires practice with a pen, paper, and ruler. We'll remind you about this later.

Let's start with bar charts. A bar chart uses rectangular bars to compare the sizes of different categories. For example, you could use a bar chart to show the favourite colours of students in a class. The height or length of each bar is proportional to the value it represents.

Next up are pie charts. A pie chart is a circular graph divided into slices, or sectors, to show the proportion of each category. The whole circle represents the total amount, or one hundred percent.