Comparing Two Groups, Treatments or Processes

Abstract

One of the most common applications of statistical analysis is to assist scientists establish (i) if one population is different from another; (ii) if one treatment is better than another; or (iii) if one process has different characteristics than another. Scientists must specify what is meant by different or better and a range of possibilities is considered in Section 12.1.3. There are, however, two new features which require an introduction before proceeding to the possible forms of comparison.