Great experiment congratulations for taking the time to do all of this. I think though the problem was that the dryer balls were plastic. My understanding is wool balls are what you need. I can't imagine how putting plastic would have any effect at all and the makers of the balls are just trying to compete with more expensive wool ones. Apologies I didn't read all the information above but I imagine you found the resultant change was not statistically significant. I guess I'll have to do my own experiment on the wool balls. Thanks for doing this one though I'll definitely not be buying plastic balls.