| http://www.w3.org/ns/prov#value | - o certain treatment or patients with particular type of illness and the primary outcome is a continuous variable for which the mean and standard deviation are expression of results or estimates of population, the sample size can be estimated using the following formulaN = (Z??/2 ) 2 s 2 / d 2 ,where s is the standard deviation obtained from previous study or pilot study, and d is the accuracy of e
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