In an observational study of classroom disruption, you record whether or not each child commits a disruptive act during each 60-second period of a 30-minute classroom observation. For this study,...

In an observational study of classroom disruption, you record whether or not each child commits a disruptive act during each 60-second period of a 30-minute classroom observation. For this study, which method is being used to quantify the observations?

a. frequency

b. duration