A business practitioner needs to perform an A/B test, sending test variant A to 10% and test variant B to 10%, after a period of 2 hours. The…

For an A/B test focusing on both open and click-through ratios, the most comprehensive indicator to

determine the winning variant is the recipient click ratio. This indicator takes into account not just

the number of clicks but also how those clicks are spread across the number of recipients, giving a

more accurate measure of engagement. The open ratio would only provide data on how many

recipients opened the email, but not on how they interacted with it, making the click ratio a better

measure of actual engagement and interest in the content of the email, which is essential for

determining the most effective delivery.

Reference: The answer is informed by general marketing practices in A/B testing and the use of

performance indicators to determine the success of email campaigns.