Probability and non-probability sampling are the two major methods of sampling typically used. There are advantages and disadvantages to both methods.
If you use a probability sample, the results are more likely to be generalizable to the target population, but this sampling method can be more costly.
Recruitment efforts should take into consideration:
The sample size needed to answer the guiding question(s)
The representativeness of the sample needed to draw accurate conclusions about the target population
The resources needed to collect the data from the sample effectively
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