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A scatter graph is used when you have two pieces of information about the same person, object, or event. Each point represents one pair of values, such as hours revised and test score.
The horizontal axis is the xxx-axis and the vertical axis is the yyy-axis. Always read the axis labels first, because swapping them changes the meaning of every point.
For example, the point (8,24)(8,24)(8,24) could mean 8 hours of revision and 24 marks. To plot (12,30)(12,30)(12,30), go 12 across on the xxx-axis and then 30 up on the yyy-axis.
Question 1
3 marksThe scatter graph shows the scores of 16 students on their Biology and Physics tests.
| Biology Score | Physics Score |
|---|---|
| 25 | 41 |
| 30 | 29 |
| 31 | 45 |
| 38 | 39 |
| 39 | 57 |
| 39 | 69 |
| 45 | 48 |
| 45 | 67 |
| 57 | 87 |
| 60 | 45 |
| 60 | 63 |
| 63 | 73 |
| 65 | 82 |
| 65 | 91 |
| 73 | 80 |
| 80 | 90 |
What does a single point represent on a scatter graph?
Revision notes for Edexcel GCSE Maths Scatter Graphs. Open the guide for explanations and worked examples. Written against the Edexcel GCSE Maths (1MA1) specification, so the content matches what's examinable rather than general Maths background.
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A scatter graph compares the age of a car with its value. The points generally slope downwards from left to right. What type of correlation does this show?
