Loading please wait

The smart way to improve grades

Comprehensive & curriculum aligned

Try an activity or get started for free

Find the Correlation on Different Scatter Graphs

In this worksheet, children will interpret information shown on a scatter graph and understand the term correlation.

'Find the Correlation on Different Scatter Graphs ' worksheet

Key stage:  KS 3

Year:  Year 8 Maths worksheets

Curriculum topic:   Statistics

Curriculum subtopic:   Understand the Relationship Between Two Variables

Difficulty level:  

Worksheet Overview

What is a variable?



We can actually tell from the name! A variable is a quantity that varies, i.e. takes different values.


One variable on its own is not that interesting - but when we have two (or even more!) of them, we can investigate the relationship between them.


To do so, we often create a scatter graph from the data collected on the two variables.


For example, here is a scatter graph where the heights (one variable) of 10 children were plotted against their weights (the other variable) of those children:


scatter graph of children's heights and weights


Let's remember that when we say something was 'plotted against' something else, it just means the first thing (e.g. heights here) is on the y-axis and the variable it was plotted against (e.g. the weights here) is on the x-axis.


The scatter graph shows us that the higher weight a child has, the taller he/she is.


There is a definite connection between weight and height.


When one variable increases as the other increases ('the higher x is, the higher y is'), we have a positive correlation.


scatter graph showing positive correlation


We can draw a line that best fits this data.  It goes in the direction of the plotted points and has roughly the same number of points above it as below.


It is known as the line of best fit.


three children of differing heights


The following scatter graphs show negative correlation (the points are going 'down') and no correlation (the points are 'random' - there is no pattern).


negative correlation scatter graph             no correlation scatter graph

    negative correlation                     no correlation


It would be possible to draw a line of best fit on the graph with negative correlation, but not on the one with no correlation.


Shall we have a go at some questions now?

What is EdPlace?

We're your National Curriculum aligned online education content provider helping each child succeed in English, maths and science from year 1 to GCSE. With an EdPlace account you’ll be able to track and measure progress, helping each child achieve their best. We build confidence and attainment by personalising each child’s learning at a level that suits them.

Get started

Try an activity or get started for free

  • National Tutoring Awards 2023 Shortlisted / Parents
    National Tutoring Awards 2023 Shortlisted
  • Private-Tutoring-WINNER-EducationInvestor-Awards / Parents
    Winner - Private Tutoring
  • Bett Awards Finalist / Parents
  • Winner - Best for Home Learning / Parents
    Winner - Best for Home Learning / Parents