Lesson 2.02c
2.02c Scatter diagrams and regression Quiz: OCR Maths, Unit 12
20 questions
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Lesson 2.02c, Scatter diagrams and regression: 20 multiple choice questions for the OCR Maths (H240), Unit 12: Data Presentation and Interpretation, written with Revision Ninja.
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The 20 questions
-
What type of data involves pairs of measurements taken from the same observation?
- Discrete data
- Univariate data
- Categorical data
- Bivariate data
-
On a scatter diagram, which axis usually displays the independent or explanatory variable?
- Vertical axis
- Primary diagonal
- Frequency axis
- Horizontal axis
-
On a scatter diagram, which axis usually displays the dependent or response variable?
- Origin axis
- Horizontal axis
- Secondary diagonal
- Vertical axis
-
What type of correlation exists when y increases as x increases?
- Positive correlation
- Negative correlation
- Inverse correlation
- Zero correlation
-
What type of correlation exists when y decreases as x increases?
- Direct correlation
- Positive correlation
- Negative correlation
- Zero correlation
-
What does it mean if points on a scatter diagram show no linear pattern?
- Exponential correlation
- Strong correlation
- Perfect correlation
- Zero correlation
-
What term describes predicting values outside the range of the given data?
- Extrapolation
- Integration
- Interpolation
- Regression
-
What term describes predicting values within the range of the given observed data?
- Interpolation
- Extrapolation
- Expectation
- Estimation
-
Why is extrapolation generally considered unreliable when using a linear regression model?
- Correlation turns negative
- Data becomes zero
- Variables become qualitative
- Trend may change
-
What feature on a scatter plot suggests the presence of distinct sub-populations?
- High density centre
- Straight horizontal line
- Separate clusters
- Uniform point spacing
-
What primary purpose does a regression line of y on x serve?
- Predict x from y
- Prove direct causation
- Calculate correlation
- Predict y from x
-
What is a third variable that creates a false apparent correlation called?
- Residual variable
- Response variable
- Confounding variable
- Explanatory variable
-
How does an extreme outlier affect a linear regression line?
- Makes slope zero
- Pulls line towards it
- Pushes line away
- Has no effect
-
What linear correlation exists if data points form a clear U-shaped curve?
- Zero correlation
- Perfect correlation
- Strong positive correlation
- Strong negative correlation
-
Which value is safest to estimate using a regression line of y on x?
- Interpolated y value
- Extrapolated x value
- Interpolated x value
- Extrapolated y value
-
What does a scatter diagram with points tightly clustered along a rising line show?
- Strong positive correlation
- Strong negative correlation
- Zero correlation
- Weak positive correlation
-
What does a scatter diagram with widely spread points showing an upward trend show?
- Weak negative correlation
- Strong positive correlation
- Weak positive correlation
- No correlation
-
Which statistical diagram is best suited for identifying bivariate relationships?
- Scatter diagram
- Histogram
- Box plot
- Cumulative frequency graph
-
What is an advantage of adding colour-coded symbols to a scatter diagram?
- Calculates correlation
- Removes outliers
- Identifies distinct groups
- Measures gradient
-
What error is made when assuming a high correlation between two variables proves a direct cause?
- Interpolation error
- Assuming causation
- Sampling bias
- Extrapolation error
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