Ordinary Least Square Estimation

There are various approaches to approximate slope and intercept in linear equation. In this chapter we will be looking at two popular approximation approaches. Those are:
    1. Ordinary Least Square
    2. Gradient descent.

Let's look into these topics now
    1. Ordinary least square approximation
       a. Ordinary least square in simple terms
       b. Math behind ordinary least square approximation
    2. Gradient descent approximation