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Information and IdeasVery hardFinding that weakens a claim about a cause

Information and Ideas practice question

A newspaper claims that the new speed cameras on the ring road are responsible for the 30% drop in accidents there this year.

Which finding, if true, would most directly weaken the newspaper's claim?

  1. A. Accidents on the city's other main roads, which have no cameras, also fell by about 30% this year, after a wet and icy previous year.Correct
  2. B. The cameras were installed in January.
  3. C. Drivers say they slow down for the cameras.
  4. D. The ring road carries the city's heaviest traffic.

Answer: A. Accidents on the city's other main roads, which have no cameras, also fell by about 30% this year, after a wet and icy previous year.

If roads without cameras fell just as much, the cameras aren't needed to explain the drop.

Why the other answers are wrong

B. The cameras were installed in January.
Timing is consistent with the claim.
C. Drivers say they slow down for the cameras.
Slowing down supports the claim.
D. The ring road carries the city's heaviest traffic.
Traffic volume doesn't bear on the cause of the drop.

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