Consider the data of Exercise 13.2.13.
(a) Conduct an appropriate analysis of the data.
(b) Describe a graphical procedure to visualize these data.
(c) Discuss how the data likely meet the necessary conditions for validity even though you do not have access to the raw data.
Exercise 13.2.13
A randomized, double-blind, clinical trial was conducted on patients who had coronary angioplasty to compare the drug lovastatin to a placebo. The percentage of stenosis (narrowing of the blood vessels) following angioplasty was measured on 160 patients given lovastatin and on 161 patients given the placebo. For the lovastatin group the average was 46%, with an SD of 20%. For the placebo group the average was 44%, with an SD of 21 %. What type of analysis is appropriate for these data?