Aresearcher measures student enthusiasm in a class that varies by size of the room (small, large) and number of students (few, many). the results show that enthusiasm in class was greatest in a small room with few students. however, when the room was large, enthusiasm was greatest with many students. what effect was described in this example?

the number of student interactions

Explanation:

Based on the information provided within the question it can be said that the effect that is being described is that of the number of student interactions. This can be said because it seems that larger rooms have more enthusiasm because there are a far greater amount of students and thus there are more interactions among the students as opposed to a smaller room with less students.