The student wants to describe how the study was carried out. Which choice most effectively uses relevant information from the notes to accomplish this goal?

Question

While researching a topic, a student has taken the following notes:
- A 2020 study examined caffeine and sleep.
- 150 adult volunteers took part.
- Each wore a sleep-tracking wristband for 30 days.
- Half of the volunteers gave up caffeine after noon; the other half kept their usual habits.
- The group that gave up afternoon caffeine fell asleep 12 minutes faster on average.

Accepted Answer

A. In the 2020 study, 150 adult volunteers wore sleep-tracking wristbands for 30 days, with half of them giving up caffeine after noon while the others kept their usual habits.. Method means what the researchers did. Choice A covers the participants, the tracking, the duration and the two conditions.

Answer

B. The group that gave up afternoon caffeine fell asleep 12 minutes faster on average. — This is the result, not the method.

Answer

C. The 2020 study of caffeine and sleep involved 150 adult volunteers. — This gives only the sample size; it leaves out what the volunteers did.

Answer

D. Drinking caffeine after noon delays sleep by 12 minutes. — This states a conclusion — and overstates it — rather than describing the procedure.

Expression of Ideas practice question

Answer: A. In the 2020 study, 150 adult volunteers wore sleep-tracking wristbands for 30 days, with half of them giving up caffeine after noon while the others kept their usual habits.

Why the other answers are wrong

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