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Expression of IdeasHardReporting a finding with its limitation

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - A study followed 300 secondary-school students. - Students who slept at least eight hours scored about 10 percent higher on tests. - Sleep hours were reported by the students themselves. - The researchers called for studies using sleep monitors. The student wants to report the finding while noting a limitation of the study.

Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. In a study of 300 students, those who reported sleeping at least eight hours scored about 10 percent higher on tests, though the sleep figures relied on the students' own reports.Correct
  2. B. Sleeping eight hours raises test scores by 10 percent.
  3. C. The study followed 300 secondary-school students.
  4. D. The researchers called for studies using sleep monitors.

Answer: A. In a study of 300 students, those who reported sleeping at least eight hours scored about 10 percent higher on tests, though the sleep figures relied on the students' own reports.

The finding, and the self-report caveat.

Why the other answers are wrong

B. Sleeping eight hours raises test scores by 10 percent.
Overstates a correlational, self-reported finding.
C. The study followed 300 secondary-school students.
Sample only.
D. The researchers called for studies using sleep monitors.
The call for more research, with no finding.

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