UsableStats: I am trying to do A/B testing onweb page displays. One is the test the other is the control. Could

Question 162:

Asked on April 22, 2008

Tags: Confidence Intervals , Control Chart , A/B Testing , p-chart

I am trying to do A/B testing onweb page displays. One is the test the other is the control.
Could you help me determine the formula for sample size at a 95% confidence level?
My historical Conversion Rate (success): 11%
Visitors: 280 per day
I would like to see a 2% improvement in my conversion rate.

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