Lesson S2.2.1
S2.2.1 Scatter diagrams and regression Quiz: Pearson Edexcel Maths, Unit 12
20 questions
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Lesson S2.2.1, Scatter diagrams and regression: 20 multiple choice questions for the Pearson Edexcel Maths (9MA0), Unit 12: Data presentation and interpretation, written with Revision Ninja.
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The 20 questions
-
What type of variable is represented on the horizontal axis of a scatter diagram?
- Dependent variable
- Independent variable
- Discrete variable
- Control variable
-
What term describes data points that do not follow the overall trend of a scatter diagram?
- Anomalies
- Residuals
- Extrapolations
- Outliers
-
Which letter conventionally represents the dependent variable in a regression equation?
- x
- y
- m
- c
-
What does Pearson's product-moment correlation coefficient measure?
- Causal relationship
- Non-linear spread
- Gradient steepness
- Linear correlation
-
What is the maximum possible value for Pearson's correlation coefficient?
- 100
- 1
- 0
- infinity
-
If points on a scatter diagram slope downwards from left to right, what is the correlation?
- Zero
- Positive
- Negative
- Undefined
-
What process estimates a y-value outside the range of the given independent variable data?
- Regression
- Interpolation
- Coding
- Extrapolation
-
What process estimates a y-value inside the range of the given independent variable data?
- Estimation
- Extrapolation
- Interpolation
- Correlation
-
Using the regression line y = 2x + 3, estimate y when x = 4.
- 7
- 11
- 14
- 9
-
If PMCC is close to zero, what can be said about the linear relationship?
- Strong correlation
- No linear correlation
- Curved correlation
- Perfect correlation
-
In the regression line equation y = a + bx, what does parameter 'a' represent?
- Independent variable
- Correlation coefficient
- Gradient
- Y-intercept
-
In the regression line equation y = a + bx, what does parameter 'b' represent?
- Mean value
- Y-intercept
- Gradient
- Outlier
-
What is the PMCC for data points that form a perfectly straight upward sloping line?
- 1
- 0
- infinity
- minus 1
-
Why might extrapolation give unreliable predictions from a regression line?
- Too many outliers
- Zero correlation
- Unseen data trends
- Data is coded
-
If a correlation coefficient is -0.85, how would you describe the strength of correlation?
- Weak negative
- Moderate zero
- Strong positive
- Strong negative
-
Which type of diagram is used to investigate potential relationships between two numerical variables?
- Scatter diagram
- Histogram
- Pie chart
- Box plot
-
What does a PMCC value of -1 indicate about two variables?
- Perfect positive correlation
- Perfect negative correlation
- No correlation
- Curvilinear relationship
-
What does a significant correlation on a scatter diagram actually fail to prove?
- Association
- Linearity
- Dependence
- Causation
-
What axis conventionally displays the independent variable on a scatter diagram?
- Vertical axis
- Random axis
- Horizontal axis
- Both axes
-
What symbol is commonly used to denote Pearson's correlation coefficient in statistics?
- r
- p
- s
- n
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