A new study concludes that children who spend more time reading physical books tend to have better concentration skills than those who primarily use digital devices for reading. The study authors recommend that parents encourage physical book reading to improve their children's concentration. Which of the following, if true, would most seriously weaken the study's conclusion?
- AChildren with naturally higher concentration skills are more likely to prefer reading physical books over digital devices.
- BThe study did not control for the socioeconomic status of the participating families.
- CDigital devices often offer interactive features that can be distracting to young readers.
- DReading comprehension scores were similar for both groups of children in the study.
Show answer & explanationAnswer & explanation
Correct answer: A. Children with naturally higher concentration skills are more likely to prefer reading physical books over digital devices.
The study suggests that reading physical books *causes* better concentration. To weaken this, one could suggest an alternative cause or reverse causation. Option A proposes reverse causation: it's not that physical books cause concentration, but rather that children who already have good concentration *choose* physical books, thus weakening the study's causal claim.
Why the other options are wrong
- B. While a lack of control for socioeconomic status could be a methodological flaw, it doesn't directly provide an alternative explanation for the observed correlation in the same way reverse causation does.
- C. This supports the study's conclusion by explaining a mechanism through which digital devices might hinder concentration, thus strengthening the argument for physical books.
- D. Similar reading comprehension scores do not directly address the claim about concentration skills, nor do they weaken the proposed causal link between physical books and concentration.
Weakening Causal Mechanisms
To weaken a proposed causal mechanism, one can introduce an alternative cause for the observed effect, demonstrate reverse causation, or show that the mechanism is implausible.
- Introduces a different reason for the outcome.
- Challenges the direction of the cause-effect link.
- Focuses on undermining 'how' or 'why' the effect occurs.
Memory trick: Is it A causes B, or B causes A, or C causes both?