Lesson S6

S6 use and interpret scatter graphs of bivariate data Quiz: Pearson Edexcel Maths, Unit 6

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson S6, use and interpret scatter graphs of bivariate data: 20 multiple choice questions for the Pearson Edexcel GCSE Maths (1MA1), Unit 6: Statistics, written with Revision Ninja.

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The 20 questions

  1. What does a positive correlation on a scatter graph show?

    • Variables decrease together
    • No relationship exists
    • Variables increase together
    • Variables are equal

  2. What does correlation not equal in scatter graph analysis?

    • Extrapolation
    • Estimation
    • Interpolation
    • Causation

  3. What is estimating a value within the range of known data points called?

    • Causation
    • Extrapolation
    • Interpolation
    • Correlation

  4. What does correlation between two variables not prove?

    • Extrapolation
    • Causation
    • Interpolation
    • Association

  5. A line of best fit passes through (2, 10) and (6, 18). What is its gradient?

    • 8
    • 0.5
    • 2
    • −2

  6. A line of best fit is y = 2x + 4. What value of y is predicted when x = 10?

    • 40
    • 20
    • 14
    • 24

  7. A scatter graph of hours studied against test score shows a strong positive correlation with line y = 8x + 30. Estimate the score for 5 hours of study.

    • 65
    • 78
    • 40
    • 70

  8. What does strong negative correlation on a car scatter graph show?

    • No relationship to age
    • Increasing value with age
    • Decreasing value with age
    • Constant value over time

  9. What does a correlation coefficient close to zero suggest?

    • No linear correlation
    • Perfect negative correlation
    • Strong positive correlation
    • Steep positive gradient

  10. What usually causes a misleading positive correlation between ice cream sales and drownings?

    • Direct causation
    • Negative correlation
    • Data recording error
    • Common third factor

  11. A line passes through (10, 50) and (20, 70). What is the predicted value at x = 30?

    • 60
    • 110
    • 70
    • 90

  12. Which type of estimate is most reliable on a scatter graph?

    • Interpolation
    • Extrapolation
    • Random estimation
    • Guesswork

  13. A line of best fit passes through (1, 2) and (5, 10). What is its y-intercept?

    • −2
    • 2
    • 0
    • 10

  14. A line of best fit has equation y = 0.5x + 3. What is the predicted y when x = 8?

    • 11
    • 4
    • 8
    • 7

  15. What is the key feature of a valid line of best fit?

    • Balanced point distribution
    • Steepest gradient possible
    • Joining every point
    • Passing through origin

  16. Which set of points shows negative correlation?

    • (1, 2), (2, 4), (3, 6)
    • (1, 5), (2, 5), (3, 5)
    • (1, 9), (2, 7), (3, 5)
    • (1, 1), (2, 3), (3, 2)

  17. Does a strong correlation between studying and grades prove causation?

    • Definitely
    • Always
    • Yes
    • No

  18. A line of best fit passes through (0, 5) and (10, 25). What is its equation?

    • y = 2x − 5
    • y = x + 5
    • y = 2x + 5
    • y = 5x + 2

  19. A line of best fit is y = −3x + 60. For what x value is y equal to 0?

    • 60
    • 3
    • −20
    • 20

  20. A line of best fit is y = 2.5x − 4. What is the predicted y when x = 12?

    • 34
    • 26
    • 30
    • 22

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