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4024/11 Oct/Nov 2023, Question 9: Scatter Diagrams and Correlation

Cambridge O Level Mathematics 4024 · Paper 11 (Non-calculator) · Non-calculator · 3 marks

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The question, in short

Scatter diagram of ten people's ages against task completion times; identify the correlation type and use a line of best fit to estimate the time for age 50.

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

Part (a) · 1 mark

State the kind of correlation visible in the scatter diagram.

  1. 1As age increases, the time increases
  2. 2Positive correlation

AnswerPositive

Part (b) · 2 marks

Draw a line of best fit and use it to estimate the completion time for a 50-year-old.

  1. 1Rule a straight line through the middle of the points, close to the mean point (43.6, 0.149)
  2. 2Go up from age 50 to the line and across to the Time axis
  3. 3Time ≈ 0.16 minutes

AnswerReading their straight line of best fit at 50

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Also searched as: 4024/11/O/N/23 · 4024_w23_qp_11 · 4024 w23 11 · question 9.
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