Ascend Confidence Interval Calculation

How do you calculate the confidence interval?

We use classic probability to calculate the conversion confidence interval.

The following formula is what we use for our calculation: 

 

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  • P = average conversion rate of the candidate
  • N = number of visitors for the candidate
  • z  = z-value for desired confidence level
    • 99% confidence, z-value = 2.58
    • 95% confidence, z-value = 1.96
    • 90% confidence, z-value = 1.645
    • 85% confidence, z-value = 1.44
    • 80% confidence, z-value = 1.28
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