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A comment on Impact of breakfast skipping compared with dinner skipping. Parent comment
https://www.surveymonkey.com/mp/sample-size-calculator/
If you are ok with a 25% margin of error and a 95% confidence level, 16 people is good enough.
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https://www.surveymonkey.com/mp/sample-size-calculator/
If you are ok with a 25% margin of error and a 95% confidence level, 16 people is good enough.