AQA · Mathematics · 8300
GCSE Maths: Graphs: scatter graphs (correlation)
Statistics · AQA GCSE Maths (8300). Cards are generated from the Corbettmaths textbook exercise and practice questions for Graphs: scatter graphs (correlation) (Corbettmaths Video 168), and every card links back to the exact page it came from. Practice tests are drawn from this deck’s own cards. Source material © Corbettmaths — used with attribution.
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What is a scatter graph used to display?
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Information about two variables for a set of data points, to show the relationship between them.
What is a line of best fit on a scatter graph?
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A straight line drawn through the data points that best represents the trend, used to estimate values.
What does positive correlation mean in a scatter graph?
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As one variable increases, the other variable also increases. The points trend upward from left to right.
What does negative correlation mean in a scatter graph?
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As one variable increases, the other variable decreases. The points trend downward from left to right.
What does no correlation mean in a scatter graph?
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There is no clear relationship between the two variables. The points are scattered randomly with no discernible pattern.
How can a line of best fit be used on a scatter graph?
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To estimate or predict values for data points not in the original dataset, by reading values from the line.
Why might extrapolation using a line of best fit be unreliable?
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The relationship shown in the data may not continue beyond the range of observed values, making predictions outside that range unreliable.
Why should a scatter graph for one breed of dog not be used to estimate values for a different breed?
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Different breeds have different characteristics and growth patterns, so the relationship established for one breed doesn't apply to another.
In a scatter graph showing a negative correlation, the line of best fit slopes ? from left to right.
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downward
In a scatter graph showing a positive correlation, the line of best fit slopes ? from left to right.
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upward
What is an outlier on a scatter graph?
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A data point that does not fit the general pattern or trend shown by the other points.
In a scatter graph showing monthly rent vs. distance from city centre, what type of correlation would you typically expect?
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Negative correlation (as distance from the city centre increases, monthly rent decreases).
Using a line of best fit to predict values outside the range of the original data is called ?.
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extrapolation
Using a line of best fit to estimate values within the range of the original data is called ?.
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interpolation
What does 'strong correlation' mean on a scatter graph?
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The data points lie close to the line of best fit, showing a clear relationship between the variables.
What does 'weak correlation' mean on a scatter graph?
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The data points are spread out from the line of best fit, showing a less clear relationship between the variables.
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