AQA · Mathematics · 8300
GCSE Maths: Graphs: scatter graphs (interpret)
Statistics · AQA GCSE Maths (8300). Cards are generated from the Corbettmaths textbook exercise and practice questions for Graphs: scatter graphs (interpret) (Corbettmaths Video 166), 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 points on a scatter graph that best represents the general trend or relationship between the variables.
What type of correlation is shown when one variable increases as the other decreases?
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Negative correlation.
What type of correlation is shown when both variables increase together?
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Positive correlation.
Why might it be inappropriate to use a scatter graph to make predictions far outside the range of the plotted data?
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Extrapolating far beyond the data range assumes the relationship continues unchanged, which may not be true. The pattern observed may not hold outside the measured range.
How can a line of best fit be used to make predictions from a scatter graph?
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By reading the corresponding value on the line of best fit for a given value of one variable, you can estimate the value of the other variable.
What does no correlation mean on a scatter graph?
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The points are scattered randomly with no clear pattern, indicating no relationship between the two variables.
In a scatter graph showing test results vs revision hours, what does positive correlation indicate?
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Generally, the more hours spent revising, the higher the test score.
Why should a scatter graph about Jack Russell dogs not be used to estimate the mass of a Poodle?
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The data is specific to one breed (Jack Russells), so the relationship may not apply to a different breed (Poodles).
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.
On a scatter graph showing apartment distance from city centre vs monthly rent, what relationship would you expect?
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As distance from the city centre increases, monthly rent decreases (negative correlation).
When reading data from a scatter graph, what are the two pieces of information each point represents?
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The value of one variable (x-axis) and the corresponding value of the other variable (y-axis) for a specific observation.
What does 'strength of correlation' refer to on a scatter graph?
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How closely the points cluster around the line of best fit; strong correlation means points are close to the line, weak correlation means they are more scattered.
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