You're interested in whether tutoring is more effective when the student volunteers to be tutored. You compare the test scores of two groups of students those who chose to go to after-school tutoring sessions and those who are required to go to the sessions by the school administration. This is an example of a (an): Select one: fieldwork study observational study survey analysis experiment

This is an example of an observational study. In an observational study, the researcher observes and measures the variables without manipulating them. In this case, the researcher is comparing the test scores of two groups of students (those who chose to go to after-school tutoring sessions and those who are required to go to the sessions by the school administration) without manipulating any variables. The researcher is simply observing the existing differences between the two groups and analyzing the data collected from them.