The answers to the given blanks above are NORMS, and CONFORMITY PRESSURES CHANGE ATTITUDES, respectively.
This research is actually based from Jean Watson (1950), an American nurse theorist who is known for her theory of Human Caring. According to her, when the given standards in an environment are changed, this also affects how a person deals with the people around his or her environment. Given above that there is lesser prejudice, this also changed their attitude by being less prejudiced.