Formula For Calculating Sample Size In Prevalence Studies. The sample size references the total number of respondents included in a study and the number is often broken down into sub-groups by demographics such as age gender and location so that the total sample achieves represents. Za2 pq where the symbol means to the power of.
It means that the where n sample size study has estimated the population prevalence as Z Z statistic for a level of confidence between 30 and 50. The sample size was determined by using the following formula Arya et al 2012. So to increase accuracy we simply need to increase the sample size.
For example if the expected prevalence is 30 then P 03.
Use the sample size formula. Za2 pq where the symbol means to the power of. In this article we present a simple formula to calculate the sample size needed to be able to identify with a chosen level of confidence problems that may arise with a given probability. The formula for estimating sample size is given as.
