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0580/13 May/Jun 2023, Question 14: Scatter Diagrams and Correlation

Cambridge IGCSE Mathematics 0580 · Paper 13 (Core) · Calculator · 3 marks

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The question, in short

From a scatter graph of shopping time against items purchased, identify the correlation, state how the two quantities are related, and add a best-fit line.

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

Part (a) · 1 mark

State which kind of correlation the plotted points display.

  1. 1As time increases, the number of items increases
  2. 2Positive correlation

AnswerPositive

Part (b) · 1 mark

Explain how the number of items bought changes as shopping time increases.

  1. 1The longer people spend in the shop, the more items they buy

AnswerCorrect description e.g. The longer people spend in the shop the more items they buy

Part (c) · 1 mark

Add a straight line of best fit to the scatter graph.

  1. 1Draw one ruled straight line following the trend of the points, from about (10, 0) up towards (80, 15)
  2. 2Keep roughly equal numbers of points above and below the line

AnswerCorrect ruled line

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Also searched as: 0580/13/M/J/23 · 0580_s23_qp_13 · 0580 s23 13 · question 14.
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