Find the fairer practice comparison
Use weighted averages and question comparisons
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Assignment preview
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The brief
Two fictional practice plans report success rates. Compute the overall results and the results within each experience group. Explain why the headline winner changes when you look more closely.
Your source packet
Fictional source notes for this exercise. No outside client data.
Plan A: beginners 18 successes out of 30; experienced learners 8 out of 10. Plan B: beginners 5 successes out of 10; experienced learners 22 out of 30. Success means completing one defined task correctly. Assignment to plans was not random. Each row contains different learners.
What to deliver
- A table of four subgroup success rates and both overall rates
- A calculation giving both plans equal beginner/experienced weights
- A 250–350 word explanation of what can and cannot be concluded
Check your understanding
- How many learners used each plan?
- Why is the unweighted average of raw success counts not a rate?