I don't doubt the value proposition that is here, and I don't doubt that the authors of this blog post will make a great video and book about A/B testing that i

I don't doubt the value proposition that is here, and I don't doubt that the authors of this blog post will make a great video and book about A/B testing that is helpful. This is fairly well trod ground though and for those that want a cheaper approach, here are some free resources that I like. Some of these are my own blog posts but I'm not selling anything so pardon the self promotion: 1. "The Pitfalls Of Bias In A/B Testing" - http://danbirken.com/ab/testing/2014/04/08/pitfalls-of-bias-in-ab-testing.html http://danbirken.com/ab/testing/2014/04/08/pitfalls-of-bias-... 2. "If You Aren't Doing Basic Conversion Optimization, You Probably Should Be" - http://danbirken.com/startups/2015/05/18/conversion-optimization.html http://danbirken.com/startups/2015/05/18/conversion-optimiza... 3. "How not to run an A/B test" - http://www.evanmiller.org/how-not-to-run-an-ab-test.html http://www.evanmiller.org/how-not-to-run-an-ab-test.html 4. "Evan Miller's sample size calculator" - http://www.evanmiller.org/ab-testing/sample-size.html http://www.evanmiller.org/ab-testing/sample-size.html 5. "ABBA Open Source A/B test calculator" - https://www.thumbtack.com/labs/abba/ https://www.thumbtack.com/labs/abba/ (and a bonus one because the improved sign up flow in the OP still had a password prompt) 6. "Password prompts are annoying" - http://danbirken.com/usability/2014/02/12/password-prompts-are-annoying.html http://danbirken.com/usability/2014/02/12/password-prompts-a...