Question: A psychologist conducts a study comparing the reactions of third-, fifth- and seventh-grade students to stressful events. She assigns each student to either a high-stress (must talk to a group of teachers) or a low-stress (must talk to friends) condition. As the students wait for their upcoming discussion, the psychologist takes several measures of anxiety: the students' blood pressure, how often they fidget, and how nervous they say they are on a self-report questionnaire. If the results of the study found only a Main Effect for Level of Stress, that would mean that: Question options: the students' level of stress registered no effect on levels of anxiety no significant effects were found grade level made no difference on levels of anxiety anxiety levels depended on levels of stress differently, according to the grade level. Need Assignment Help?