I've just been doing some Google AdSense analysis for some web sites that have moderate traffic. The owner said that I can publish this bit of information from her site. She's interested to hear if other AdSense publishers have had similar results.
The objective was to find out which day of the week the Cost Per Click (CPC) was the highest. So we ran the averages across a number of pages and the average CPC by day of week ranked the days in order from worst to best as follows:
Before running the analysis she was pretty certain that Tuesday was the best day of the week and was surprised to see that Saturday was in fact the best.