4.3 Quadrates samples

• The sample needs to be random (bias). 
• The second part of the sample is that it needs to be representative (large).
• A sample needs to be big enough so the estimate has to be close to the real population. 
• The grid system is going to work like the x,y coordinates on a graph you would draw.
• The random numbers are used to generate a number for the x and y coordinates and will tell us where to take a sample from.