One concept that I found interesting in Chapter 14 of Epsteins text was random sampling because I always found this interesting when I learned about this in my science class.

Random sampling is a sample chosen randomly where that at every choice there is an equal chance that any of the remaining members of the population is picked (Epstein, 284).

For example, when you are trying to determine the average number of individuals who like playing sports and who those who don't in San Jose State University. It wouldn't be reasonable to pick a sample group from those of the athletic department because they may all like to play sports, that would not be a good sample. But, to pick individuals at random would be a more better sample because the group wouldn't be concentrated in one area. The average would be weighted equal and not lean towards one side.