7. A psychologist performs the following experiment: she gives subjects photographs of female faces and asks them to rate the attractiveness of each face.

A psychologist performs the following experiment: she gives subjects photographs of female faces and asks them to rate the attractiveness of each face. However, some of the subjects have just had to take a very difficult math test, while others have taken a very easy math test. The psychologist would probably be a __________ psychologist.

1. industrial
2. comparative
3. developmental
4. social