AQA · Mathematics · 8300
GCSE Maths: Graphs: scatter graphs (draw)
Statistics · AQA GCSE Maths (8300). Cards are generated from the Corbettmaths textbook exercise and practice questions for Graphs: scatter graphs (draw) (Corbettmaths Video 165), 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 line of best fit on a scatter graph?
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A straight line drawn through the middle of the data points on a scatter graph that shows the general trend of the relationship between the two variables.
What does positive correlation mean in a scatter graph?
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As one variable increases, the other variable also increases. The points generally 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 generally trend downward from left to right.
How is a line of best fit used to make predictions from a scatter graph?
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You find the value on one axis, trace across or up/down to the line of best fit, then read off the corresponding value on the other axis.
What does no correlation mean in a scatter graph?
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There is no relationship between the two variables. The points are scattered randomly with no clear pattern.
What type of correlation would you expect between hours of revision and test scores?
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Positive correlation. Generally, more hours of revision leads to higher test scores.
What type of correlation would you expect between distance from London and rental cost of apartments?
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Negative correlation. Generally, the further from London, the lower the rental cost.
Why might a scatter graph not be appropriate for estimating data about a different category?
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The relationship shown applies only to the category studied. Different categories may have completely different relationships between the variables.
What is an outlier in a scatter graph?
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A data point that lies far away from the general pattern of the other points and does not fit the correlation trend.
When plotting data on a scatter graph, what two things must you do to the axes?
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Scale them appropriately and clearly label them.
How can you estimate values between data points on a scatter graph?
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By drawing and using a line of best fit.
Why might it be inappropriate to use a line of best fit to estimate values far outside the range of your data?
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The relationship may not continue in the same way beyond the data range (extrapolation is unreliable).
When describing correlation on a scatter graph, you should mention both the ? and the strength.
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type
What are the three types of correlation that can be shown on a scatter graph?
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Positive correlation, negative correlation, and no correlation.
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