Shiny A/B Split Tester

Which creative is performing better?

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Shiny A/B Tester

significance in performance difference.

Example: I've sent out 500 emails with headline A and 500 with headline B. 50 people clicked headline A and 70 clicked on headling B. Can I expect headline B to perform better in general? 

str(prop.test)

## function (x, n, p = NULL, alternative = c("two.sided", "less", "greater"), 
##     conf.level = 0.95, correct = TRUE)