Lesson L2

L2 Scatter diagrams, regression lines and correlation Quiz: AQA Maths, Unit 11

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

In partnership with Revision Ninja

Lesson L2, Scatter diagrams, regression lines and correlation: 20 multiple choice questions for the AQA Maths (7357), Unit 11: Statistics, written with Revision Ninja.

Host it live on the board and students join with a game code on their own devices, or revise alone with Free Play. The answers are revealed in the game.

Host this setFree Play

The 20 questions

  1. Why does correlation between two variables not guarantee causation?

    • Data is non-linear
    • Correlation is zero
    • Samples are random
    • Confounding variables exist

  2. What type of correlation occurs when one variable increases as the other increases?

    • Positive correlation
    • Negative correlation
    • Zero correlation
    • No correlation

  3. In a scatter diagram showing strong negative correlation, points lie close to a line with what gradient?

    • Positive gradient
    • Infinite gradient
    • Zero gradient
    • Negative gradient

  4. Within what range must the product moment correlation coefficient r lie?

    • -1 to 1 inclusive
    • 0 to infinity
    • 0 to 1 inclusive
    • -10 to 10 inclusive

  5. What do two distinct clusters of points on a scatter diagram suggest about the data?

    • Linear regression model
    • Strong positive correlation
    • Two sub-populations
    • High measurement error

  6. How is a correlation coefficient of r = -0.9 best described?

    • Strong negative linear
    • Strong positive linear
    • Weak positive linear
    • Weak negative linear

  7. A regression line of mark on revision hours has gradient 3.5. What does 3.5 represent?

    • Marks per hour
    • Total exam mark
    • Hours per mark
    • Initial test score

  8. A point lies far away from the rest of a scatter diagram and pulls the line of best fit towards it. What is it called?

    • A correlation coefficient
    • A residual of zero
    • An outlier
    • A cluster

  9. What does a correlation coefficient of r = 0.05 indicate about two variables?

    • Strong negative correlation
    • Strong positive correlation
    • Almost no correlation
    • Moderate negative correlation

  10. What is making predictions outside the range of given data called?

    • Extrapolation
    • Interpolation
    • Regression
    • Correlation

  11. High correlation between ice cream sales and drownings is caused by what type of variable?

    • Lurking variable
    • Response variable
    • Explanatory variable
    • Extrapolated variable

  12. All points lie exactly on a straight line with negative gradient. What is the value of r?

    • -1
    • 0
    • -0.5
    • 1

  13. If data on a scatter diagram clearly forms two separate groups, how should it be analysed?

    • Extrapolated
    • Combined
    • Separately
    • Ignored

  14. How would a product moment correlation coefficient of r = 0.6 be described?

    • Weak negative
    • Moderate positive
    • Strong negative
    • Strong positive

  15. Shoe size and reading score are positively correlated in children due to which lurking variable?

    • Height
    • Age
    • Gender
    • IQ

  16. What value will Pearson's product moment correlation coefficient r give for U-shaped data?

    • Exactly 1
    • Close to zero
    • Close to -1
    • Close to 1

  17. For car value y = 50 - 2x in thousands of pounds, what does 50 represent?

    • Annual depreciation
    • Minimum car value
    • Maximum age
    • New car value

  18. For car value y = 50 - 2x in thousands of pounds, what does -2 represent?

    • Maximum car age
    • Total car cost
    • Initial car value
    • Annual value drop

  19. If all x-values in a dataset are multiplied by 2, what happens to Pearson's r?

    • Doubles
    • Remains unchanged
    • Halves
    • Becomes negative

  20. Why is a correlation coefficient calculated from a sample of 5 data points unreliable?

    • Small sample size
    • Incorrect variables
    • Extrapolation error
    • Non-linear relationship

All AQA Maths quizzes