A/B testing useful links

When starting to learn A/B testing these resources are very useful:

• http://en.wikipedia.org/wiki/Statistical_significance – Statistics fundamentals: learn about Statistical significance
• http://www.abtests.com/ – Examples of real A/B tests. You can see screenshots, changes and conversion results.
• http://super.hubspot.com/calculator/ – Find out if your A/B test results are statistically significant
• http://visualwebsiteoptimizer.com/ab-split-test-duration/ – How long should you run the test?
• http://visualwebsiteoptimizer.com – Free trial for 30 days