General links
www.mathsrevision.net/alevel/pages.php?page=60
http://www.physics.csbsju.edu/stats/
http://pages.uoregon.edu/mgall/statistical_significance_v.htm
http://wilderdom.com/research/effectsizes.html

Research Methods in Real Life 'So you're a Gemini? Maybe I should drive...'
http://www.suncorpmetway.com.au
http://carinsurance.arrivealive.co.za/which-star-signs-have-the-best-and-the-worst-drivers.php