Information and IdeasVery hardFinding that weakens a claim about an intervention
Information and Ideas practice question
A council claims that its new traffic-calming humps reduced speeds on the estate, citing average speeds 8 km/h lower in the month after installation than in the month before.
Which finding, if true, would most directly weaken the council's claim?
- A. During the month after installation, the estate's main road was partly closed for gas works, and the remaining lane had a temporary 20 km/h limit enforced by a marshal.Correct
- B. Residents had asked for the humps.
- C. The humps are painted with reflective stripes.
- D. Speed humps have reduced speeds on other estates.
Answer: A. During the month after installation, the estate's main road was partly closed for gas works, and the remaining lane had a temporary 20 km/h limit enforced by a marshal.
A closure and an enforced temporary limit in the same month give another reason for the lower speeds.
Why the other answers are wrong
- B. Residents had asked for the humps.
- Residents' requests don't bear on the cause of the change.
- C. The humps are painted with reflective stripes.
- Irrelevant to the cause.
- D. Speed humps have reduced speeds on other estates.
- Other estates' results support the claim if anything.
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