Deciding when to end the test. how is this calculated

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Doing A/B testing on an ecommerce web site. I have been working on rule of thumb of 500 vistors through each page or 50 conversions on one of the page before ending the test and deciding which is the best page. I assume there is more scientific way of deciding when to end the test. How is this calculated?

Reference no: EM13241261

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