Pain after surgery: In a random sample of 50 patients undergoing a standard surgical procedure, 21 required medication for postoperative pain. In a random sample of 99 patients undergoing a new procedure, only 14 required pain medication.
Part: 0/2
Part 1 of 2
(a) Construct a 95% confidence interval for the difference in the proportions of patients needing pain medication between
the old and new procedures. Let P, denote the proportion of patients who had the old procedure needing pain medication.
Use tables to find the critical value and round the answer to at least three decimal places.
A 95% confidence interval for the difference in the proportions of patients needing pain
medication between the old and new procedures is
Please help?