hard · GMAT Quant

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?

  1. The researcher fails to consider that expanded public transit infrastructure often attracts developers, leading to higher urban density.
  2. The density of the cities studied is significantly higher than the average density of rural areas in this system in this system.
  3. Many people living in high-density areas still own private vehicles for weekend travel in this system in this system in this system.
  4. Public transit usage is at an all-time high in several cities regardless of their density levels in this system in this system.
  5. The researcher's definition of 'density' is consistent with the definition used by the national census bureau in this system in this system.

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