Exam-style question
Try this first
A scatter diagram shows positive correlation between two variables. What limitation must be stated?.
- A.correlation does not imply causation
- B.2n
- C.1n^2
- D.1n
Model answer
What a good answer should say
- The correct answer is correlation does not imply causation.
This answer is tied to the objective: L2 Interpret scatter diagrams and regression lines for bivariate data, including recognition of scatter diagrams with distinct sections of the population; understand informal interpretation of correlation; understand that correlation does not imply causation; calculations involving regression lines are excluded..
Explanation
Why this works
Use the explanation to connect the worked answer back to L2 Interpret scatter diagrams and regression lines for bivariate data, including recognition of scatter diagrams with distinct sections of the population; understand informal interpretation of correlation; understand that correlation does not imply causation; calculations involving regression lines are excluded..
The distractors change the result or the form of the answer. The canonical solution reaches correlation does not imply causation, so correlation does not imply causation is the only option consistent with the working.
Maths method check
- Topic focus: Statistics.
- Question style: practice.
- Reasoning demand: application.
- Check the operation, notation, units, and final answer form against the question before moving on.
Common mistake
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