101) An administrator believes that the placement of motivational posters : 2063700
101) An administrator believes that the placement of motivational posters on the walls in classrooms of academic buildings will lead to increased grade-point averages at his school. To test his theory, in one of the academic buildings he randomly assigns certain classrooms to have the posters while others do not. None of the remaining four buildings on campus have any posters placed in their classrooms. What is the independent variable in this study?
a. Classroom wall hangings
b. Gender of the student
c. Academic institution
d. Grade-point average
102) Medical researchers want to determine if hypnosis is better at pain control than either a sugar pill (placebo) or motivating instructions. The researcher randomly assigns participants to the three groups and determines how long they can keep their hands in a bowl of ice water. What is the manipulated variable?
c. Sugar pill
d. Pain control group
103) Suppose a researcher wants to determine if the size of the observing crowd to some emergency situation is relevant to whether the victim will receive help. The researcher randomly assigns participants to one of three groups: no other bystanders, one other bystander, or four other bystanders. When an emergency is then staged, the researcher measures how long it takes the participant to help the victim. In this study, what is the independent variable?
a. Number of bystanders
b. The group with four other bystanders
c. The group with one other bystander
d. The group with no other bystanders
104) Suppose a researcher wants to see if those students who highlight their textbook as they read will perform better on the psychology mid-term compared to those students who do not highlight. What is the dependent variable?
a. Psychology mid-term score
b. Highlighting of text
c. No highlighting of text
d. Grade-point average
105) A medical doctor believes that the presence of aromatherapy will reduce the anxiety of first-time mothers-to-be during labour and will increase their reported satisfaction with their care at his hospital. He randomly assigns mothers to give birth in a room either with or without aromatherapy. What is the independent variable in this example?
a. Room environment
b. Number of previous birthing experiences
c. Anxiety level during labour
d. Satisfaction with hospital care