Final answer:
The only difference between the PMM and GMM used in lesson two is the choice of mathematical model.
Step-by-step explanation:
The only difference between the PMM (Poor Man's Model) and GMM (Goodrich Model) used in lesson two is the choice of mathematical model. The PMM uses a simple linear regression model to make predictions based on a single independent variable. On the other hand, the GMM uses a more sophisticated model called the Gaussian Mixture Model, which can handle multiple independent variables and capture complex patterns in the data.