Jack is interested in determining people's favorite fast food restaurants. Based on a previous survey, Jack knows 80% of the campus enjoys Jack-in-the-Box and 20% of campus enjoys McDonalds. Jack walks around campus recruiting individuals until he finds 8 Jack-in-the-Box lovers and 2 McDonalds lovers.

You will need to determine which sampling technique is used in each of these examples. Possible answers include: simple random sampling, stratified random sampling, proportional stratified sampling, cluster sampling, systematic sampling, convenience sampling, quota sampling, and purposive sampling