Plan from the supplied facts
Fictional A requires 4–8 hours and B 6–7. Every pair within those bounds is allowed, with no probabilities. A’s minimum is lower but its maximum higher. An “always lower effort” claim must hold for every permitted pair, not only the favourable endpoints.
| Permitted pair | A h | B h | Lower |
|---|---|---|---|
| Pair 1 | 4 | 7 | A |
| Pair 2 | 8 | 6 | B |
| Range comparison | 4–8 | 6–7 | No universal winner |
Work through the choice
Both ranking directions have a permitted counter-scenario. The difference A−B spans −3 to +2 hours, crossing zero.
Can A be chosen as always lower effort because four is below six?
Show the worked answer
No. A=8,B=6 is permitted and reverses that ranking. Choosing still needs a stated risk preference or additional evidence.
Material to use in your plan
List option bounds, allowed joint scenarios and counterexamples to universal dominance. Keep preference decisions separate from claims proved by the bounds.