medium · SAT Reading & Writing
A cognitive-science team studying adolescent sleep surveyed five groups of high school students, each defined by average nightly sleep, and measured each group's average reaction time on a timed task. Hypothesis: Adolescents who sleep fewer hours per night show slower average reaction times. Graph 1. Average Nightly Sleep vs. Average Reaction Time Average Nightly Sleep (hours): 6 7 8 9 10 Average Reaction Time (ms): 310 290 265 250 252 Which choice most effectively uses data from the graph to illustrate the researchers' hypothesis?
- The data show that reaction time will keep improving without limit for every additional hour of sleep beyond ten hours.
- Each of the five sleep-duration groups in the study contained more than 40 adolescent participants.
- Students averaging 6 hours of sleep had a 310 ms reaction time vs. 250 ms at 9 hours — less sleep, slower reaction.
- The graph shows that reaction time became consistently slower as average nightly sleep increased from 6 to 10 hours.
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