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Visual representations make data easier to interpret. At GCSE you need to draw and interpret bar charts, dual/composite bar charts, pie charts, stem-and-leaf diagrams and pictograms.
| Term | Definition |
|---|---|
| Bar chart | Uses bars of equal width; the height represents frequency |
| Dual bar chart | Two sets of bars side by side for comparison |
| Composite bar chart | Bars stacked on top of each other |
| Pie chart | A circle divided into sectors; the angle of each sector is proportional to the frequency |
| Stem-and-leaf diagram | Displays data using stems (leading digits) and leaves (trailing digits) in order |
| Pictogram | Uses symbols to represent frequencies; includes a key |
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