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Year 10 - Maths

Estimating from scatter graphs

Graphical representations of data: scatter graphs and time series

Unit Summary

In this unit pupils will learn how to interpret and extract data from scatter graphs and time series graphs.

Lesson Summary

You will learn to estimate from scatter graphs.

Key Notes

  • When a linear trend can be identified, you can draw a line of best fit.
  • The line of best fit should represent the trend of the data.
  • The line of best fit can be used to estimate the values of a data point.
  • Lines of best fit should only be used to estimate the dependent variable.

Vocabulary To Learn

  • Line of best fit: A line of best fit is a line where the distance between each data point and the line is minimised.

Common Mistakes To Avoid

  • The line of best fit always start at the origin.

3 Quick Questions (With Answers)

1. Solve this in steps: explain the method from this lesson and why each step matters.

When a linear trend can be identified, you can draw a line of best fit. The line of best fit should represent the trend of the data.

2. Use this key word in a maths sentence and explain it clearly. 'Line of best fit'

A line of best fit is a line where the distance between each data point and the line is minimised. Use this word when showing your method, then check your final answer is reasonable.

3. Spot and fix this common maths mistake.

Mistake: The line of best fit always start at the origin. Correction: The line of best fit could start at the origin but it does not always start there. This could be exemplified clearly with a scatter graph that has negative correlation.

More Lessons In This Unit

Browse all guides in the Year 10 Maths guide library.