Comparing Two Groups, Treatments, or Processes
One of the most common applications of statistical analysis is to assist investigators establish (i) whether one population is different from another; (ii) whether one treatment is better than another; or (iii) whether one process has different characteristics from another. You 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 that require an introduction before we proceed to the possible forms of comparison.
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