medium · GMAT Verbal
A researcher concludes that 'A causes B' on the grounds that a study found a high correlation between A and B.
Which of the following, if true, most weakens this conclusion?
- An independent third factor, C, is known to produce both A and B on its own.
- The correlation between A and B was found to be statistically significant.
- The participants in the study were randomly selected from the population.
- The study was conducted continuously over a span of ten years.
- No study has ever found a correlation between A and B as strong as the one observed here.
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