Exam-style question
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A fixed number of independent trials each have two outcomes and constant probability of success. Which distribution model is appropriate?.
- A.a binomial model is appropriate
- B.2a
- C.1a^2
- D.1a
Model answer
What a good answer should say
- The correct answer is a binomial model is appropriate.
This answer is tied to the objective: N3 Select an appropriate probability distribution for a context, with appropriate reasoning, including recognising when the binomial or Normal model may not be appropriate..
Explanation
Why this works
Use the explanation to connect the worked answer back to N3 Select an appropriate probability distribution for a context, with appropriate reasoning, including recognising when the binomial or Normal model may not be appropriate..
Trace the calculation before choosing. The verified method for Distribution selection gives a binomial model is appropriate; no later explanation is allowed to change that value.
Maths method check
- Topic focus: Statistics.
- Question style: practice.
- Reasoning demand: analysis.
- Check the operation, notation, units, and final answer form against the question before moving on.
Common mistake
No common mistake is linked to this question yet.