Lesson T6.1.3

T6.1.3 Scatter graphs Quiz: KS3 Maths, Unit 6

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson T6.1.3, Scatter graphs: 20 multiple choice questions for the KS3 Maths (National Curriculum), Unit 6: Statistics, written with Revision Ninja.

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The 20 questions

  1. A scatter graph shows what?

    • The frequency of each category in the data
    • Changes in one variable only, over time
    • The relationship between two variables
    • Parts of a whole, shown as slices of one total

  2. What does positive correlation mean?

    • The two values are equal at every point plotted
    • As one variable increases, the other tends to increase
    • There is no pattern between the two variables
    • As one increases, the other decreases steadily

  3. Which pair is most likely to show negative correlation?

    • Time since a phone was charged and its battery level
    • Age and height of children in one class
    • Height and shoe size of the same group of people
    • Hours practised and the skill level reached by each student

  4. What does no correlation mean?

    • There is no clear pattern between the points
    • There is a negative correlation
    • All the points have the same value
    • All the points lie on a straight line

  5. What is a line of best fit?

    • A line that joins every point
    • A line that always passes through the origin
    • A line that follows the trend as closely as possible
    • A line that shows only the mean

  6. Points lie roughly on a straight line that slopes up. What is the correlation?

    • Strong positive
    • No correlation
    • Zero correlation
    • Strong negative

  7. What is an outlier on a scatter graph?

    • The point at the origin, where both axes start
    • The median value of the x-variable on the graph
    • A point far away from the general pattern
    • The mean point of the data, found by averaging

  8. A line of best fit has the equation y = 2x + 1. What is y when x = 5?

    • 9
    • 11
    • 5
    • 10

  9. Predicting a value inside the range of the data is called what?

    • An outlier
    • Interpolation
    • Correlation
    • Extrapolation

  10. Correlation does not prove what?

    • A relationship
    • A pattern
    • A trend
    • Causation

  11. Which description fits bivariate data?

    • Data with no numbers, only words and labels
    • Data with one variable recorded for each item
    • Data with two variables recorded for each item
    • Data with three variables recorded for each item

  12. A scatter graph of hours of revision against test score has points clustered in the top right. What does this suggest?

    • Less revision is linked to higher scores
    • The scores are random
    • More revision is linked to higher scores
    • There is no link

  13. Points lie close to the line y = -3x + 20. What is the correlation?

    • No correlation
    • Strong negative
    • Strong positive
    • Weak positive

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

    • 4
    • 2
    • 8
    • 0.5

  15. What does the trend in a scatter graph describe?

    • The general direction the points follow
    • The title of the graph, placed at the top
    • The mean of one variable, marked on the axis
    • The axis labels and the title of the graph

  16. A scatter graph shows the number of pets against the number of siblings, with points spread randomly. What is the correlation?

    • Perfect positive
    • No correlation
    • Strong negative
    • Strong positive

  17. Temperature is on the x-axis and cups of hot chocolate sold is on the y-axis. As temperature rises, the points fall. What is the correlation?

    • Perfect
    • Positive
    • Negative
    • No correlation

  18. A point is far from the line of best fit. What is this called?

    • A median
    • A range
    • An outlier
    • A mode

  19. On a scatter graph, which axis usually shows the independent variable?

    • The x-axis (horizontal)
    • The y-axis (vertical)
    • Neither axis, only the points
    • Both axes, equally

  20. Points lie along y = x + 2. What is y when x = 7?

    • 7
    • 14
    • 9
    • 5

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