GCSE · Scatter graphs & correlation

Scatter graphs & correlationExam-style questions

Why one point on a scatter graph is one individual measured twice, how to describe correlation by type and strength in the words of the question, why a correlation never proves a cause, and how to place a line of best fit — through the bulk of the data, balanced either side, ignoring a genuine outlier.

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10 questions · GCSE (Higher) level · mark scheme and worked solution on each · no sign-up to try

DifficultyAllLevel 1Level 2Level 3Level 4Level 5
  1. 1
    For each of 1010 days in November, a café recorded the midday temperature, in °C, and the number of hot chocolates it sold that day. The scatter graph shows this information.5101520102030405060Midday temperature (°C)Hot chocolates sold(a) Write down what one point on the scatter graph represents.

    (b) On how many of these days did the café sell more than 4040 hot chocolates?

    (c) Describe the correlation shown by the scatter graph.
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