Starting from the preliminaries through live examples, the author tells the
story about what a sample intends to communicate to a reader about the
unknowable aggregate in a real situation. The story develops its own logic and a
motivation for the reader to put up with, herein follows. Various intellectual
approaches are set forth, in as lucid a manner as possible. Developments reached
hitherto are presented and reviewed. Certain fresh and unseen problems are also
noted and possible solutions are hit upon.