Caselet Data Interpretation
Caselets hide the data in a paragraph. Extracting the numbers into a small table or a Venn layout before solving, handling successive percentages, and using the two-set union rule without double-counting.
What you will be able to do
- Extract a caselet's numbers into a table or Venn layout before calculating.
- Chain successive percentages from a starting quantity without losing a step.
- Apply the two-set union rule and separate the 'only' regions from the overlap.
- Catch a constraint stated in the middle of a paragraph.
What is inside this lesson
- 1What a caselet is
- 2Extracting a numeric-narrative caselet
- 3Set-based caselets and the union rule
- 4Worked example: a recruitment funnel
- 5Worked example: two banking channels
- 6Mistakes specific to caselets
- 7Quick revision
- 8Practice
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What a caselet is
A caselet gives you no table and no chart — the numbers are written into a paragraph, often as percentages of one another and in a chain ("of those who did X, some fraction did Y"). Two shapes are common: a numeric-narrative caselet, where quantities flow from a starting total, and a set-based caselet, where two or three groups overlap.
The work is almost entirely in the extraction. Once the paragraph is turned into a small table or a Venn layout, the questions are ordinary arithmetic.
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