Dr. Peter J. Meyers (AKA “Dr. Pete”) is Marketing Scientist for Seattle-based Moz, where he works with the marketing and data science teams on product research and data-driven content. He has spent the past three years building research tools to monitor Google, including the MozCast Project, and he curates the Google Algorithm History, a chronicle of Google updates back to 2002. He can usually be found on Twitter @dr_pete.
Dr. Pete is a cognitive psychologist and computer scientist by training. He spent eight years building a web-based event start-up (eventually as Executive VP) before starting his own search consultancy and eventually joining the Moz team in 2012.
Split Test Calculator & Decision Tool
http://drpete.co/split-test-calculator
This calculator can be used to interpret the results of a usability-oriented split (A/B) test. This is a basic scenario where you have two groups of Visitors (A & B) who each get to see one version of your website and for whom you track the number of Conversions or Goals (purchases, downloads, click-throughs, etc.).