How many sample size for an exploratory study utilizing online survey whose population are adults in a country? Particularly how certain product is being used by the adult population.
For your study it doesn't matter. See a introduction to statistics book
To calculate the sample size you must always start from the reference population.
However, as specified by those who preceded me, you have to start studying statistics seriously.
as a general rule sample size depends on population size and whether the phenomenon in population regarding this variable is natural occurring meaning it follows normal distribution. Then one has to use sample size formula. For exploratory one small samples are alright and even t-tests. Still we recommend n=25 to 50 for some reliability even exploratory nature. Again exploratory research depends on topic and field. One can do exploratory research even as case study. First thing is it qualitative or quantitative research .
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