Year 8 - Maths
Interpreting scatter graphs
Graphical representations of data
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This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
In this unit pupils will interpret and construct a range of representations of data including bar charts, pie charts and scatter graphs.
Lesson Summary
You will learn to interpret scatter graphs using the data points shown.
Key Notes
- Scatter graphs can be used to find a second value when the first value is known.
- A general trend may be observed from a scatter graph.
- Extrapolation may not be valid as this is outside the data set.
Vocabulary To Learn
- Interpolation: Interpolation is the process of estimating unknown values that are inside the range of existing data.
- Extrapolation: Extrapolation is the process of estimating unknown values that are outside the range of existing data.
Common Mistakes To Avoid
- Pupils may assume that all there is always a connection between variables in scatter graphs.
3 Quick Questions (With Answers)
1. Solve this in steps: explain the method from this lesson and why each step matters.
Scatter graphs can be used to find a second value when the first value is known. A general trend may be observed from a scatter graph.
2. Use this key word in a maths sentence and explain it clearly. 'Interpolation'
Interpolation is the process of estimating unknown values that are inside the range of existing data. Use this word when showing your method, then check your final answer is reasonable.
3. Spot and fix this common maths mistake.
Mistake: Pupils may assume that all there is always a connection between variables in scatter graphs. Correction: Emphasise examples showing no/weak connections, but explain that the tasks use data containing stronger connections for purpose of practice.
More Lessons In This Unit
- Checking understanding of pictograms and bar charts Study Guide
- Constructing bar charts by utilising technology Study Guide
- Constructing pie charts Study Guide
- Constructing pie charts by utilising technology Study Guide
- Constructing scatter graphs Study Guide
- Constructing scatter graphs by utilising technology Study Guide
- Interpreting pie charts Study Guide
- Problem solving with graphical representations of data Study Guide
- Securing constructing bar charts by hand Study Guide
- Securing constructing pictograms Study Guide
Browse all guides in the Year 8 Maths guide library.