Chapter 12. Sample Surveys . Idea 1: Examine a Part of the Whole. The first idea is to draw a sample. We’d like to know about an entire population of individuals, but examining all of them is usually impractical, if not impossible.
Cluster sampling is not the same as stratified sampling.
4. You are interested in estimating the average number of hours dormitory residents spend studying. Three dormitories are chosen at random. In each dormitory, one floor is chose at random and all the students on that floor are interviewed.