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If you're interested in a web-based calculator, I've found this one to be useful: http://www.usereffect.com/split-test-calculator http://www.usereffect.com/spli

• paraschopra 16y ago
  Yup, but do note that the calculator you linked is based on Chi-square and the one in excel is based on z-test. So, results may differ slightly! In case you need to use a web-based calculator (z-test), here is one on my site: http://visualwebsiteoptimizer.com/ab-split-significance-calculator/ http://visualwebsiteoptimizer.com/ab-split-significance-calc...
  • btilly 16y ago
    Why did you choose to use the z-test?
    • paraschopra 16y ago
      Z-test gives you confidence intervals on conversion rate with G-test or Chi-square test doesn't
      • btilly 16y ago
        Good point. Confidence intervals that shouldn't be trusted too much, but confidence intervals none the less.
• briancray 16y ago
  I really prefer Chapra's due to the cleanliness of the design and clarity of results.