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What you need to know
What you need to know:
Scatter graphs are used when we wish to plot data that is comparing two variables, e.g. students’ performances in Maths tests and English tests. Questions on scatter graphs may involve any of the following:
- Plotting a scatter graph from a table of data;
- Determining if there is any correlation (if the two variables are related), whether it is positive correlation (as one increases, the other increases) or negative correlation (as one increases, the other decreases), and how strong the correlation is;
- Drawing a line of best fit – the line which roughly goes through the middle of all your data points;
- Using your line of best fit to interpolate (look within the range of your data) or extrapolate (look outside the range of your data) new information, whilst understanding that both are estimations, and that extrapolation is a particularly risky method in that it made not provide a very accurate estimate at all.
Note that when drawing your line of best fit, it is very useful to a) have a clear ruler so you can see all the data, and b) once you’ve drawn it, check that you have the same (or very nearly the same) number of data points on either side of the line – this is usually a good indicator that you’ve done it correctly.
From scatter graph plotting to drawing the line of best fit, the resources on this page cover all aspects of scatter graph questions that are relevant to the GCSE Maths 9-1 course. Regardless of if you are a GCSE Maths tutor in Harrogate or you teach Maths in York, the resources on this scatter graph page will come in handy when designing your lesson plans or if you are looking for materials to create a homework sheet.
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