A large high school wants to select a group of 20 students in order to see how well the cafeteria is serving the student body. The school randomly selects 5 freshmen, 5 sophomores, 5 juniors and 5...

A large high school wants to select a group of 20 students in order to see how well the cafeteria is serving the student body. The school randomly selects 5 freshmen, 5 sophomores, 5 juniors and 5 seniors from a list of students.

Indicate the type of sampling strategy involved.
This sampling strategy is stratified sampling.
This sampling strategy is systematic sampling.

This sampling strategy is convenience sampling.
This sampling strategy is clustered sampling.
This sampling strategy is SRS.