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CIE · IGCSE · Mathematics

Statistics: Correlation and lines of best fit on scatter diagrams
Practice Questions

20 CIE IGCSE Mathematics questions on Statistics: Correlation and lines of best fit on scatter diagrams, each with instant feedback and a full examiner-style mark scheme.

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Try 2 sample questions on Statistics: Correlation and lines of best fit on scatter diagrams

Question 1 · 1 mark · Difficulty 3/3

A scatter diagram shows that as the value of x increases, the value of y decreases in an approximately linear pattern. The product-moment correlation coefficient for this data is most likely to be which of the following?

  1. -0.78
  2. 0.03
  3. 0.85
  4. -0.02
Show answer & explanation
✓ Answer: A-0.78
-0.78 indicates a strong negative correlation, which matches a pattern where y decreases as x increases in a near-linear way. Option A (0.85) represents strong positive correlation. Option B (0.03) represents virtually no correlation. Option D (-0.02) represents virtually no correlation, just with a negative sign.
Question 2 · 1 mark · Difficulty 3/3

The mean point (x̄, ȳ) for a data set is (12, 35). A student correctly draws the line of best fit. Which of the following must be true about this line?

  1. It passes through the point (12, 35)
  2. It passes through the origin (0, 0)
  3. It has a positive gradient
  4. It passes through the point with the highest y-value
Show answer & explanation
✓ Answer: AIt passes through the point (12, 35)
A correctly drawn line of best fit must always pass through the mean point (x̄, ȳ), which here is (12, 35). The line does not necessarily pass through the origin unless the data happens to support that. The gradient can be positive or negative depending on the data. The line is not required to pass through any extreme data point.
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CIE IGCSE Mathematics: Statistics: Correlation and lines of best fit on scatter diagrams FAQ

How many CIE IGCSE Mathematics questions on Statistics: Correlation and lines of best fit on scatter diagrams are there on Kramizo?
Kramizo currently has 20 exam-board-aligned practice questions on Statistics: Correlation and lines of best fit on scatter diagrams for CIE IGCSE Mathematics, with new questions added every week. Each question gives you instant feedback and a full examiner-style mark scheme that tells you exactly what would earn marks on a real CIE paper. The questions span the full difficulty range — from straightforward recall (level 1) right up to multi-step reasoning and evaluation (level 3) — so the bank works for first-pass revision and final exam-week stress testing alike.
Is Kramizo free for CIE IGCSE students preparing for Mathematics?
Yes — completely free. Every student gets 45 questions a day on the free plan, with no card required and no trial countdown. That free quota works across every subject and every topic in our bank, so you can mix Statistics: Correlation and lines of best fit on scatter diagrams practice with other Mathematics topics or even switch to a totally different CIE subject without paying anything. Kramizo's optional Pro plan removes the daily cap and adds detailed progress analytics, but the free tier is the real product — used by thousands of GCSE, IGCSE and CSEC students.
Are the Statistics: Correlation and lines of best fit on scatter diagrams questions aligned to the official CIE IGCSE Mathematics syllabus?
Every question is written against the published CIE IGCSE Mathematics specification, including the exact command words (state, describe, explain, calculate, evaluate, etc.), mark allocations, and difficulty tier you'd see on a real CIE paper. Explanations are written in the style of official examiner mark schemes — they tell you what is being awarded marks and why distractors are wrong, not just whether you got it right. The bank is continually refined to match the latest syllabus updates from CIE.
How is Statistics: Correlation and lines of best fit on scatter diagrams typically tested on CIE IGCSE Mathematics papers?
Statistics: Correlation and lines of best fit on scatter diagrams appears across multiple question types on real CIE IGCSE Mathematics papers — most commonly as multiple-choice questions in the objective section, structured short-answer questions in the main paper, and occasionally as part of an extended response. Kramizo's practice bank reflects that mix: 4-option MCQs, true/false statements, fill-in-the-blank key terms, multi-select questions, and ordering questions. Working through the bank gives you exposure to every question style examiners actually use.

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