You are doing an experiment to test whether exercise improves self-control in children. half of the children will jump rope for five minutes before being left alone in a room with a bowl of candy. the other half of the children will color for five minutes before being left alone in the room with the candy. you plan to measure how long it takes for each child to begin eating the candy as well as how much candy the children consume. which statement about your research is true? a. your dependent variable has two operational definitions. b. your independent variable has two operational definitions. c. your study does not have a control group. d. your study has the advantage of taking place in a real-world setting.