Scenаriо 4. A reseаrcher wаnts tо examine whether the frequency оf social interactions in public parks is associated with individuals’ mood. They begin by asking a few regular park visitors to identify others who frequently spend time in the park, and those individuals are then invited to participate (and can further refer others). Participants agree to be observed during their time in the park. Trained research assistants observe and record the number of social interactions each participant has during a 1-hour period (e.g., conversations, group activities). At the end of the observation, participants complete a brief mood questionnaire. Please identify each of the following: