Dr. Pena is conducting research to see whether the severity of the chronic headaches suffered by her patients will be lessened through the use of biofeedback. Based on what she has read in medical journals and on her own observations, Dr. Pena has determined that the headaches are caused by muscle tension, so she feels that patients who learn to relax will have fewer or less severe headaches. To test her theory she attaches electrodes to the forehead of each of her patients. These electrodes measure electrical activity from the subjects forehead muscles and drop when they receive feedback in the form of soothing music. Dr. Pena finds that compared to a separate control group of people to whom electrodes are attached but do not receive the feedback, the experimental group reports fewer and less severe headaches during the week following the biofeedback session.

Dr. Pena is conducting research to see whether the severity of the chronic headaches suffered by her patients will be lessened through the use of biofeedback. Based on what she has read in medical journals and on her own observations, Dr. Pena has determined that the headaches are caused by muscle tension, so she feels that patients who learn to relax will have fewer or less severe headaches. To test her theory she attaches electrodes to the forehead of each of her patients. These electrodes measure electrical aetlvlty from the subjects forehead muscles and drop when they receive feedback in the form of soothing music. Dr. Pena finds that compared to a separate control group of people to whom electrodes are attached but do not receive the feedback. the experimental group reports fewer and less severe headaches during the week following the biofeedback session. 1. Dr. Pena used a -sub]eets design in her experiment. a. Within 1:. Between 0. Mixed d. Crossed e. Mixed-Within 2. What was Dr. Penn's independent variable? a. electrodes 17. severity of chronic headaches c. the subjects' foreheads d. use of biofeedback e. the subjects' muscles 3. What was Dr. Penn's dependent variable? a. electmdes b. severity of chronic headaches c. soothing music d. use of biofeedback e. the subjems' foreheads 4. How many factors are there in Dr. Pena's experiment? a. 0 b. 1 c. 2 d. 3 e. 4 5. How many levels are there in Dr. Pena's experiment? a. 0 b. 1 c. 2 (l 3 e. 4 For this Lesson you will be given these formulas for the examination: There are no formulas for this chapter