Say we investigate prevelanve of diabetes mellitus in a dental setting and the previous studies use different sample sizes. Which sample size to use. As a rule of thumb, I know that 400 is enough for epidemiological studies.
Hi,
Yes, 400 is enough for Egypt population - 92000000,
confidence level=95%, confidence interval=4.9% and percentage 50%.
See http://www.surveysystem.com/sscalc.htm
nice link
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