A clinical psychologist working at a university counseling center develops a 10-minute stigma-reduction video featuring university administrators, faculty, staff, and students talking about their experiences seeking psychological treatment for emotional concerns. She wants to know if her video makes a difference in the likelihood of help-seeking for emotional concerns. She contacts a professor who agrees to let her come to his classroom and show his class the video. Before the psychologist shows the class the video, she asks participants to rate themselves on the scale of 1-10 on the question "If you experience a mental health issue, how likely would you seek mental health services?" (10 = very likely, 1 = not at all likely). After the 10-minute video, she asks participants to rate themselves again. She also collects demographic information (i.e., age, gender, country of origin) on this sample.

Is this a correlational study or experiment study?