7.1 The Central Limit Theorem for Sample Means
Baran, Daya. “20 Percent of Americans Have Never Used Email.”WebGuild, 2010. Available online at http://www.webguild.org/20080519/20-...ver-used-email (accessed May 17, 2013).
Data from The Flurry Blog, 2013. Available online at blog.flurry.com (accessed May 17, 2013).
Data from the United States Department of Agriculture.