Quote:
The manager of a nuclear power plant defended the claim that the plant was safe by revealing its rate of injury for current workers: only 3.2 injuries per 200,000 hours of work, a rate less than half the national average for all industrial plants. The manager claimed that, therefore, by the standard of how many injuries occur, the plant was safer than most other plants where the employees could work.
Which one of the following, if true, most calls into question the manager’s claim?
(A) Workers at nuclear power plants are required to receive extra training in safety precautions on their own time and at their own expense.
(B) Workers at nuclear power plants are required to report to the manager any cases of accidental exposure to radiation.
(C) The exposure of the workers to radiation at nuclear power plants was within levels the government considers safe.
(D) Workers at nuclear power plants have filed only a few lawsuits against the management concerning unsafe working conditions.
(E) Medical problems arising from work at a nuclear power plant are unusual in that they are not likely to appear until after an employee has left employment at the plant.
Premise: A nuclear power plant has an injury rate of 3.2 injuries/200,000 hours worked, which is less than half the national average for all industrial plants.
Conclusion: When measured by the standard of how many injuries occur, the plant is safer than most other plants where the employees could work.
We’re looking to weaken the argument.
A. While this would be annoying for the workers, it doesn’t weaken the conclusion. However they’re learning safety precautions, it could still be effective.
B. This is irrelevant, because we already have an injury rate. How they’re reported doesn’t matter.
C. Irrelevant. This ostensibly clarifies what counts as an injury, but we don’t need that defined.
D. Irrelevant. We don’t know what the rate of lawsuits is compared to other industrial plants.
E. This weakens the argument. If medical problems are unlikely to manifest until after the employee no longer works at the nuclear plant, then they might not be reported, meaning this injury rate could be artificially low. In that case, the plant might not be the safest choice of employer when measured by how many injuries occur.
Best answer is E.