What is the best location on the page for pay per click advertising for best click

[Scrampy]

through rate? I'm curious about advertising psychology and buying habits. Does anyone know the statistics associated with ppc advertising? What is the best location on the page to place the adds? next to photo? close to the left? or right? after a small intro to an article? I'm mostly interested in if people click adds on the left or right side of the page more often.
Thank You! Very Helpful indeed. :)