Question 9 10 pts The emergency room at Hospital X is running a trial on pain relievers. A random sample of 200 patients with minor aches receive pain reliever A. Of these patients, it was found that 177 had no aches within one hour of treatment. Another random sample of 300 patients with minor aches received pain reliever B. For this group, it was found that 120 of the patients had no aches within one hour of treatment. What is the probability that the difference in proportions from treatment A minus treatment B is greater than .5? O .339 0 7.2 O .661