A theory is just a mathematical model to describe the observations.
In our earlier chapters, we covered some basics of statistical terminology and strategy, and we have realized that, at the basic level, there are two primary objectives for data analysis. The first is a comparison of different samples, and we have covered the more common tests for those. We are now in the realm of the second objective, which is to determine if there is a relationship between variables, and if so, to quantitatively define that relationship as closely as possible.
The simplest ...