21. Nezlek and colleagues (1997) had participants first write self-descriptions and then exchange them with four other students also taking part in the study. Then the students privately ranked the other students on how much they would like to work with them on the next task. One group of participants were then told that they had been selected to work on the next task with the rest of the group;

this was the inclusion condition. The remaining participants were told that they had not been chosen to work with the others and would work alone—the exclusion condition. At this point, participants were asked about how accepted they felt. Earlier, at the start of the study, they had completed a self-esteem scale.

Figure 10 shows regression lines for the two experimental groups. Explain what these two lines mean to a person who understands correlation but knows nothing about prediction.