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...

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.

1. Estimate the risk difference in pain relief between treatments


2. Estimate the relative risk in pain relief between treatments.


3. Estimate the odds ratio in pain relief between treatments.


4. Construct a 95% confidence interval for the odds ratio.