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0580/23 Oct/Nov 2025, Question 6: Scatter Diagrams and Correlation

Cambridge IGCSE Mathematics 0580 · Paper 23 (Extended) · Non-calculator · 4 marks

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The question, in short

Scatter diagram compares values of ten paintings in 2005 and 2025, in thousands of dollars. Identify an outlier, plot a new point, count paintings below a 2005 value, and state the correlation type.

Summarised in our own words. Use the official paper for the exact wording and the diagram.

Part (a) · 1 mark

Circle the point whose 2025 value lies below the general trend of the other points.

  1. 1Most points follow an upward trend; the point at (70, 60) is well below it
  2. 2Draw a ring around the point (70, 60)

AnswerA ring around the point (70, 60)

Part (b) · 1 mark

Plot the point at 75 on the 2005 axis and 140 on the 2025 axis.

  1. 1$75 000 = 75 thousand across, $140 000 = 140 thousand up
  2. 2Plot the point at (75, 140)

AnswerPoint correctly plotted at (75, 140)

Part (c) · 1 mark

Count how many points have a 2005 value below 53.

  1. 1Draw a vertical line at 53 on the 2005 axis and count the points to its left
  2. 2Number of paintings = 5

Answer5

Part (d) · 1 mark

State the type of correlation shown by the scatter diagram.

  1. 1As the 2005 value increases, the 2025 value increases
  2. 2Positive correlation

AnswerPositive

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Also searched as: 0580/23/O/N/25 · 0580_w25_qp_23 · 0580 w25 23 · question 6.
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