QuestionShingles is a painful, but not life-threatening, skin rash. A doctor has discovered a new ointment that he believes will be more effective in the treatment of shingles than the current medication. Eight patients are available to participate in the initial trials of this new ointment. It turns out that the new ointment does appear to be effective, but it is more effective for younger patients. A second study is planned, and many more patients are available. Based on the knowledge gained from the first study, which method is best to use in the second study? Use age as the response variable Decide which patients receive the new ointment using a multistage sample Use treatment and control groups and also ensure that the patients in the two groups are similar in terms of age Design the second study in the same way as the first