hard · LSAT Logical Reasoning

A city's public health department noted that neighborhoods with a higher density of streetlights have lower rates of nighttime pedestrian injuries than neighborhoods with a lower density of streetlights. The department concluded that installing additional streetlights in Elm District, which currently has a low density of streetlights, will lower Elm District's rate of nighttime pedestrian injuries.

The health department's argument requires assuming which one of the following?

  1. Every past nighttime injury in Elm District happened at a spot that currently lacks a streetlight.
  2. The new streetlights will be made by the same company that made lights in other well-lit areas.
  3. Fewer injuries in well-lit areas are not mainly explained by those areas having safer road design.
  4. The city has budgeted enough funding to light Elm District at the density of the best-lit areas.
  5. Elm District residents currently walk at night less often than residents of well-lit neighborhoods.

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