There are 600 pharmacies distributed to 6 neighborhoods how to calculate the sample required to make a survey and what is sampling technique as the unit for thhe survey is a pharmay
Hi Mohamed,
Your sample size could be determined from previous similar research or the prevalence of your outcome of interest (I'm unsure what this is in your study).
As for the sampling strategy, you'd probably want to go for a stratified random sample, with stratification based on the neighborhood.
I hope you find this useful.
If the pharmacies are not equitably distributed in the 6 neighborhoods, I propose you to take at random 30 or 40% of the pharmacies of each neighborhood.
It depends on your research question
If your research question may be affected by differences between neighbourhoods then it would be best to use a clustered design (similar to clustered RCTs)
If your research question is population oriented then you may sample based on population densities for example
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