Variance in research has to do with how things differ from one another. It is, in fact, the whole point of doing the research in the first place. We look for variation…the differences between the ratings of different radio stations, the value placed on a course or an instructor by students, and so forth. After all, if everyone felt the same about everything and behaved the same, there would be no need to conduct social research. If we couldn’t find new species in agriculture which increase yields or have better resistance to cold or dry climates, then there would be no point in doing agricultural research.