Question

ab test how many visitors do I need in each group

Answer 1

First off, congrats on taking the dive into data-driven marketing. The answer to your question varies considerably based on what you're trying to test, and how you're trying to test it. You should keep note that establishing some degree of statistical significance is how you determine whether you can 'rely' on the results of your test. Without this bit of analysis, your conclusions are in jeopardy of being misinformed. 

Answer 2

Congo sis..............