Question

Dr. Joseph thinks that most people are generally trusting of strangers. He did a study at his university in the United States to test this idea, and the results confirmed his hypothesis. This study is in _________.

Answer 1

based on the description, I think the study would be in: cultural psychology

Cultural psychology studies the relationship between a person's behavior and the cultural value around that person.
Since cultural values vary from one place with another, The conclusion that Dr. Joseph got from American culture, could be very different if it tested in another culture.