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Expression of IdeasHardPresenting a result with its limitation

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - A company tested its sleep app on 40 volunteers for a month. - Volunteers reported sleeping an average of 25 minutes longer by the end. - There was no control group. - Volunteers knew they were being studied.

The student wants to present the study's result while acknowledging a limitation. Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. Volunteers reported sleeping 25 minutes longer, though without a control group the gain cannot be credited to the app.Correct
  2. B. The company tested its sleep app on 40 volunteers for a month.
  3. C. Volunteers reported sleeping 25 minutes longer, which proves the app works.
  4. D. Because there was no control group, the study found nothing at all.

Answer: A. Volunteers reported sleeping 25 minutes longer, though without a control group the gain cannot be credited to the app.

Result plus limitation: choice A gives the 25-minute finding and the missing control group that limits what it shows.

Why the other answers are wrong

B. The company tested its sleep app on 40 volunteers for a month.
This gives the setup, not the result or a limitation.
C. Volunteers reported sleeping 25 minutes longer, which proves the app works.
This gives the result but overclaims it and ignores the limitations.
D. Because there was no control group, the study found nothing at all.
The study did find a reported gain; the limitation weakens the conclusion, it doesn't erase the result.

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