easy · GMAT Verbal Reasoning
A researcher is studying the relationship between urban density and public transit usage. The researcher concludes that 'higher density causes increased transit usage.'
Which of the following, if true, identifies a flaw in the researcher's reasoning?
- The researcher ignores that expanded public transit infrastructure often attracts developers, which in turn raises urban density.
- The density of the cities studied is significantly higher than the average density of rural areas elsewhere in the same country.
- Many people living in high-density areas still own private vehicles, which they use mainly for weekend travel outside the city.
- Public transit fares in the cities studied were raised twice during the study period, according to the cities' own annual reports.
- The researcher's definition of 'density' is consistent with the definition that the national census bureau uses for urban areas.
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