A recent study demonstrates that students who write out their notes on paper actually learn more than those who take notes with a laptop. Which of the following would be an appropriate question to assess this study's external validity?
Group of answer choices
A. Did the study use random assignment to the study conditions?
B. How did they measure learning?
C. Is there a large enough sample to detect a statistical difference?
D. Did the study use random sampling of the population?



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