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Information and IdeasVery hardFinding that weakens a claim about a cause

Information and Ideas practice question

A council claims that its new litter bins cut the amount of litter in the park, since the litter collected fell by half in the month after the bins were installed.

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

  1. A. The month after the bins were installed was unusually wet, and the park's visitor numbers fell by half.Correct
  2. B. The new bins are larger than the old ones.
  3. C. Visitors say they like the new bins.
  4. D. The bins are emptied twice a week.

Answer: A. The month after the bins were installed was unusually wet, and the park's visitor numbers fell by half.

Half the visitors would mean half the litter regardless of bins.

Why the other answers are wrong

B. The new bins are larger than the old ones.
Bin size doesn't bear on the cause of the fall.
C. Visitors say they like the new bins.
Liking the bins doesn't show they cut litter.
D. The bins are emptied twice a week.
Emptying frequency doesn't explain the amount collected falling.

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