Answer:
The sampling method used is Convenience sampling.
Step-by-step explanation:
Convenience sampling is a non-probability sampling method that involves the selection of sample from the easiest source available. In this sampling method the samples are selected from the most convenient possible way.
Foe instance, samples taken from social media, nearest shopping mall, and so on.
In this case the students selected 10 friends to answer the survey.
This is an example of convenience sampling method because sampling your friend is the easiest sample anyone could collect.
Thus, the sampling method used is Convenience sampling.