Magic of multifactor testing revealed by fun physics experiment

If you haven't discovered Mark Anderson's Stats Made Easy blog yet, check it out!  Mark offers a wry look at all things statistical and/or scientific from an engineering perspective. You will find posts on topics as varied as nature, science, sports, politics, and DOE.  His latest post, Magic of multifactor testing, involves a fun DOE with bouncy balls. 

The first article follows the setup of Mark's DOE. At the bottom of Part 1, click on the Related Links tab to find Part 2 (Results) and Part 3 (Data and Details)