Lesson S6
S6 Scatter graphs, correlation and lines of best fit Quiz: AQA Maths, Unit 6
20 questions
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Lesson S6, Scatter graphs, correlation and lines of best fit: 20 multiple choice questions for the AQA GCSE Maths (8300), Unit 6: 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.
The 20 questions
-
As one variable increases, what does the other variable do in a positive correlation?
- Increases
- Stays constant
- Equals zero
- Decreases
-
What does correlation NOT indicate?
- Causation
- Association
- Strength
- Direction
-
What is the main purpose of drawing a line of best fit on a scatter graph?
- Calculate frequency
- Show the trend
- Connect all points
- Find the mean
-
What is estimating a value within the range of given data points called?
- Extrapolation
- Correlation
- Integration
- Interpolation
-
What is estimating a value beyond the range of given data points called?
- Extrapolation
- Correlation
- Interpolation
- Causation
-
How do points appear on a scatter graph showing a strong negative correlation?
- Horizontal line
- Sloping downwards
- Sloping upwards
- Vertical line
-
What relationship exists between two variables if a scatter graph shows no correlation?
- Inverse proportion
- Direct proportion
- No relationship
- Perfect relationship
-
What type of data involves two variables and is displayed on a scatter graph?
- Categorical data
- Univariate data
- Bivariate data
- Qualitative data
-
A line of best fit passes through (2, 10) and (6, 26). What is its gradient?
- 8
- 4
- 2
- 16
-
A line of best fit is y = 4x + 2. What is the predicted value of y when x = 5?
- 4
- 22
- 18
- 20
-
Why might shoe size and reading ability in children show a strong correlation?
- Feet help reading
- Reading grows feet
- Purely random chance
- Age affects both
-
A prediction is made for x = 12 using data only from x = 1 to x = 10. What is this called?
- Sampling
- Interpolation
- Extrapolation
- Correlation
-
A prediction is made for x = 4 using data from x = 1 to x = 10. What is this called?
- Interpolation
- Bias
- Sampling error
- Extrapolation
-
A line of best fit passes through (0, 3) and (4, 11). What is the predicted value at x = 7?
- 17
- 21
- 14
- 11
-
Revision time and test marks show a strong positive correlation. What does this indicate?
- Association only
- Perfect accuracy
- Guaranteed success
- Direct causation
-
What is a data point that lies far away from the main pattern called?
- Intercept
- Outlier
- Median
- Gradient
-
(H) A line of best fit passes through (1, 5) and (5, 13). What is its equation?
- y = 3x + 2
- y = x + 4
- y = 2x + 3
- y = 2x + 5
-
(H) Using y = 2x + 3, what is the estimated y when x = 10?
- 23
- 30
- 20
- 13
-
(H) A correlation coefficient of r = -0.9 is found. Which description is correct?
- Strong positive correlation
- No correlation
- Strong negative correlation
- Weak positive correlation
-
(H) A line of best fit has gradient 0.5. By how much does y change for a 10-unit increase in x?
- 5
- 50
- 10
- 0.5
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