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This lesson covers scatter graphs — how to plot them, identify the type of correlation, draw a line of best fit, and use it to make predictions. Scatter graphs are tested frequently on the AQA GCSE Mathematics paper and are a key topic for understanding the relationship between two variables.
A scatter graph (also called a scatter diagram or scatter plot) is used to show the relationship between two variables. Each point on the graph represents one piece of data with two values — one plotted on the x-axis and one on the y-axis.
Scatter graphs are used when you want to investigate whether there is a relationship (correlation) between two quantitative variables. For example:
A teacher recorded the number of hours of revision and the test score for 10 students.
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