Treating circulatory disease: Angioplasty is a medical procedure in which an obstructed blood vessel is widened. In some cases, a wire mesh tube, called a stent, is placed in the vessel to help it remain open. A study was conducted to compare the effectiveness of a bare metal stent with one that has been coated with a drug designed to prevent reblocking of the vessel. A total of 5312 patients received bare metal stents, and of these, 832 needed treatment for reblocking within a year. A total of 1112 received drug-coated stents, and 121 of them required treatment within a year. Can you conclude that the proportion of patients who needed retreatment differs between those who received bare metal stents and those who received drug-coated stents? Lep 1 denote the proportion of patients with bare metal stents who needed retreatment. Use the = 0.10 level and the critical value method with the table.
Part 1 out of 5
State the appropriate null and alternate hypotheses.
Part 2: How many degrees of freedom are there, using the simple method?
Part 3: Find the critical values. Round three decimal places.
Part 4: Compute the test statistic. Round three decimal places.
