"Great Exportations: China overtakes Germany to become the biggest exporter of all", from The Economist online, Mar 31st 2010, http://www.economist.com/daily/chartgallery/displayStory.cfm?story_id=15836406&source=features_box4
1. The World Trade Organization, WTO carried out the study.
2. The sponsor was undisclosed.
3. The funds probably come from the nations of the WTO, as the economies would be interested in the leading exporting nations.
4. The data seems to be gathered from the individual nations worldwide. This would mean the sample was not random. However, problems may occur since the data may be inaccurate as the not every transaction may not be accounted for. The methodology to collecting the data would be carried out yearly, if not quarterly.
5-6. The results are communicated clearly as the data is presented in a bar graph and displays the world share as a percentage for each nation.