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Sample Size, Study Limits, and Uncertainty
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Health & Wellness
HW.019 Sample Size, Study Limits, and Uncertainty
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A press release says, 'Wellness journaling causes better sleep.' The study followed students who chose whether to journal and measured sleep at the end of the month. Which revision is most accurate?
A
The study proves sleep causes journaling, so the press release should say the opposite.
B
Journaling causes better sleep for all students who try it.
C
Wellness journaling has no relationship with sleep because students chose it.
D
Students who chose to journal reported better sleep, but the study cannot prove journaling caused the difference.
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