The population of my pilot research is 120 alumni students of my department. I only sent my online questionnaire to nearly 40 of them who were present in a common Facebook group of ours. Among them, 16 responded to my questionnaire. Now, I can't understand the type of sampling method. Can I call it Stratified Random Sampling?
Manzoor has provided a good answer. It would be purposive sampling if you have selected the 40, from the 120, for specific characteristics that you want them to have and know that they posses. However, if you chose them because they were the only ones available on Facebook and, therefore, the easiest for you to access - then that would be convenience sampling.
Md. Didarul Islam - I think you have used purposive sampling. It is a group of people believed to be typical or average or a group specially picked for a unique purpose. The researcher never knows if the sample is representative of the population and this method is largely limited to exploratory research.
It is not stratified random sampling because in it the researcher first identifies the relevant strata and their actual representation in the population e g., strata might be male/female, managers/non-managers, rural/urban, literate/illiterate etc.
Manzoor has provided a good answer. It would be purposive sampling if you have selected the 40, from the 120, for specific characteristics that you want them to have and know that they posses. However, if you chose them because they were the only ones available on Facebook and, therefore, the easiest for you to access - then that would be convenience sampling.
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