Guinness World Records reported that, as part of an anti-bullying campaign, elementary school students in Pennsylvania created a chain of friendship bracelets that was a world-record 2678 feet long (www.guinnessworldrecords.com/ news/2013/5/fan-choice-record-may-17-48702/). Guinness relies on what kind of data for amazing claims like this one? How does th is relate to the calculation of ranges?