1. A clinical trial is conducted comparing a new pain medication for arthritis. Participants are randomly assigned to receive the new medication or a placebo. The outcome is pain relief within 30 minutes. The data are shown below. Pain Relief No Pain Relief New Medication 44 76 Placebo 21 90 Estimate the risk difference in pain relief between treatments RD= Estimate the relative risk in pain relief between treatments RR = Estimate the odds ratio in pain relief between treatments OR= The upper and lower limits of the ORare shown below Lower Limit of CI: 0.41 Upper Limit of CI: 1.61