Information and IdeasHardComparing two randomly formed groups
Information and Ideas practice question
Average time to solve a puzzle, with participants assigned at random to one of two conditions:
With music playing: 8.5 minutes
In silence: 6.0 minutes
A researcher claims that participants solved the puzzle faster in silence. Which choice most effectively uses data from the table to support the claim?
- A. Participants in silence averaged 6.0 minutes compared with 8.5 minutes for those with music, and the groups were formed at random.Correct
- B. Participants with music playing averaged 8.5 minutes.
- C. The two groups were formed at random.
- D. Both groups solved the puzzle in under ten minutes.
Answer: A. Participants in silence averaged 6.0 minutes compared with 8.5 minutes for those with music, and the groups were formed at random.
The claim is a comparison; choice A gives both averages and the random assignment that makes the comparison fair.
Why the other answers are wrong
- B. Participants with music playing averaged 8.5 minutes.
- One time, no comparison.
- C. The two groups were formed at random.
- The design detail without the result.
- D. Both groups solved the puzzle in under ten minutes.
- True but irrelevant to which group was faster.
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