Researchers compared college students who reported they had smoked marijuana at least fifteen days a month with similar students who said they smoked five days a month at most. A day after going without marijuana, the heavy users performed significantly worse on tasks that involved sustaining and shifting attention. The research design is

Question

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The research design is a comparison-group design because it involves comparing the performance of two distinct groups of participants (heavy marijuana users vs. light or infrequent users) on specific tasks. This design allows for the examination of differences between groups under different conditions or treatments.

Researchers Compared College Students Who Reported They Had Smoked Marijuana