1.17 Course satisfaction across sections: large college class has 160 students. All 160 students attend the lectures together, but the students are divided into 4 groups, each of 40 students, for lab sections administered by different teaching assistants. The professor wants to conduct a survey about how satisfied the students are with the course, and he believes that the lab section a student is in might a↵ect the student's overall satisfaction with the course.

a) What type of study is this?
b) Which of the following sampling strategies is best for this study?