Variation A is declared a winner at 90% statistical significance with a difference interval of .10% and 4%. The control's conversion rate is 15%. Which of the following could be Variation A's conversion rate?
im new in optimizely , im still learning so i had a little quiz and they asked me that question , and i had to choose between 12%, 18% , 20% and 40% .
the right answer was 18% , i just want to know what is the calculation that i have to do to get this result.