Final answer:
The types of sampling used in the described scenarios include simple random sampling, cluster sampling, stratified sampling, convenience sampling, and systematic sampling.
Step-by-step explanation:
The question involves identifying which type of sampling is used in various scenarios related to the collection of data on the number of credits taken by students. Here are the matched sampling techniques to the given scenarios:
Simple random sampling is when the campus lists all of the students and then collects data on the number of credits taken by randomly selected students.
A case of cluster sampling is when the campus randomly selects 20 classes and then collects data on the number of credits taken by students in just those classes.
Stratified sampling is used when the campus divides the students based on degree type and then collects data on the number of credits of randomly selected students from each degree type.
Convenience sampling is exemplified when someone on campus collects data on the number of credits students are taking by asking 30 students as they are leaving the cafeteria.
Systematic sampling is when the campus lists all of the students and then collects data on the number of credits taken by every 5th student on the list.