Heimildir
Heimildir
7.1 Höfuðsetning tölfræðinnar fyrir úrtaksmeðaltöl
Baran, D. (2010). 20 percent of Americans have never used email. WebGuild. Sótt af http://www.webguild.org/20080519/20-percent-of-americans-have-never-used-email
The Flurry Blog. (2013). Sótt af http://blog.flurry.com
U.S. Department of Agriculture. (án dags.). Sótt af https://www.usda.gov/
7.2 Höfuðsetning tölfræðinnar fyrir summur (valfrjálst)
Farago, P. (2012, 29. okt.). The truth about cats and dogs: Smartphone vs tablet usage differences. Flurry Analytics Blog. Sótt af http://flurrymobile.tumblr.com/post/113379683050/the-truth-about-cats-and-dogs-smartphone-vs
7.3 Notkun höfuðsetningar tölfræðinnar
The Wall Street Journal. (án dags.). Sótt af https://www.wsj.com/
Centers for Disease Control and Prevention. (2017, 16. apríl). National health and nutrition examination survey. National Center for Health Statistics. Sótt af http://www.cdc.gov/nchs/nhanes.htm