Answer:
Time sampling
Explanation:
In an observation study, time sampling refers to a method of measuring behavior which is where an observer records activity at defined intervals. Therefore, it is a method of collecting information in which a observer watch participants during research for a prescribed amount of time and record their particular behavior. As per the question, the researcher manage the observation period, every 10 min she observes behavior for 5 min, then takes 5 min off during the party and it an example of time sampling.