Question 5 6 pts A study was performed to test if acupuncture is as effective at reducing lower back pain as traditional treatment. 1162 volunteers were recruited and were randomly assigned to be given either traditional treatment, acupuncture, or a sham acupuncture with the needles not placed in the same spots or as deeply as in real acupuncture. The two acupuncture groups were determined to differ substantially from the conventional treatment, but not from each other. Which of the following concepts were utilized in this study? (Select all that apply) O Comparison Group Blindness Placebo Double Blindness Random Assignment O Random Sampling