SOLUTION: A clinical trial is conducted comparing a new pain reliever for arthritis to a placebo. Participants are randomly assigned to receive the new treatment or a placebo. The outcome

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 Click here to see ALL problems on Probability-and-statistics Question 306102: A clinical trial is conducted comparing a new pain reliever for arthritis to a placebo. Participants are randomly assigned to receive the new treatment or a placebo. The outcome is pain relief within 30 minutes. The data are shown in table 6-8 Pain relief no Pain relief New medication 44 76 Placebo 21 99 a. Generate a 95% confidence interval for the proportion of patients on the new medication who report pain relief. b. Generate a 95 % confidence interval for the difference in proportions of patients who report pain relief. how it calculated with 30 mins ? I'm still not understand. Answer by stanbon(57377)   (Show Source): You can put this solution on YOUR website!A clinical trial is conducted comparing a new pain reliever for arthritis to a placebo. Participants are randomly assigned to receive the new treatment or a placebo. The outcome is pain relief within 30 minutes. The data are shown in table 6-8 Pain relief no Pain relief New medication 44 76 Placebo 21 99 a. Generate a 95% confidence interval for the proportion of patients on the new medication who report pain relief. sample proportion: 65/240 = 0.27 standard error = E = 1.96*sqrt[0.27*0.73/240] = 0.056 --- 95% CI: 0.27-0.056 < p < 0.27+0.056 =========================================== b. Generate a 95 % confidence interval for the difference in proportions of patients who report pain relief. ---- sample proportion: (44/120)-(21/120 = 23/120 = 0.19 standard error: 1.96*sqrt(0.19*0.81/120) = 0.07 --- 95% CI: 0.19-0.07 < P < 0.19+0.07 ======================================= Cheers, Stan H.