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Statistics involves collecting, organising, presenting and interpreting data. At KS3 you will calculate measures of average and spread, construct and interpret a range of charts, and use scatter graphs to explore relationships between variables.
| Type | Description | Examples |
|---|---|---|
| Qualitative (categorical) | Non-numerical | Colours, names, types |
| Quantitative discrete | Numerical, exact values | Number of siblings, shoe size |
| Quantitative continuous | Numerical, any value in a range | Height, temperature, time |
| Grouped data | Continuous data in class intervals | 10 ≤ h < 20 |
| Measure | Definition | Best used when… |
|---|---|---|
| Mean | Sum of all values ÷ number of values | No extreme outliers |
| Median | Middle value when data is ordered | Data has outliers |
| Mode | Most frequent value | Categorical data or finding the most common |
Example data: 4, 7, 3, 9, 7, 11, 4, 7, 2 → Ordered: 2, 3, 4, 4, 7, 7, 7, 9, 11
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