<span>because Memphis was the capital of Egypt</span>
The settlers of Roanoke was starving, and they soon left Roanoke in search of food, came across friendly Indian tribes, and decided to just live with them. They didn't think of going back of course
hope this helps
It all depending on the type of information that you want to get.
for example, if you want to obtain quantitative data, you need to use the model that are realisticly allow you to count a certain type of information from the subjects. If you want to obtain qualitative data, direct observations or field works would probably be the best model.