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Verbal·Information and Ideas·Command of Evidence

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A scientist concludes that exposure to natural light improves productivity.
Results:
Natural light group: productivity increased 18%
Artificial light group: productivity increased 3%
Control group: productivity increased 1%

Which choice best explains how the data support the scientist’s conclusion?

A

The natural light group showed a much larger productivity increase than either comparison group, consistent with a benefit from natural light.

B

All three groups improved by about the same amount, showing that lighting type made no difference.

C

The artificial light group improved most, which contradicts the conclusion about natural light.

D

The control group declined while both light groups improved, showing only that any intervention helps.