Researchers at the university wanted to investigate how the amount of time (minutes) people spent doing moderate to high intensity physical exercise at the school’s recreation center varied by whether the person was a student or faculty, and whether the activity took place in the spring, summer, or fall semester. They randomly selected 100 individuals from the university who visited the recreation center regularly over a period of 2 years and documented their position (student or faculty), the semester, as well as the total time each person spent doing exercise.
What are the factors?
How many levels does each factor have?
What are the experimental units?