This video introduces a new type of statistical question: which model is best and by how much? We want to persuade you to adopt an attitude. Here are the principles that got us to this point:

1. variables: the way we split the world into pieces we can study
2. relationships between variables: the way we recognize how variability works
3. likelihood: uncertainty about the population given just a sample
4. covariation: all variables may be related to each other
5. statistical models: a way of stating precisely what we know about a population