I am doing my first A/B testing. I want to do a 10/10/80 with 2 different subject lines, but the "Test Sample Size" slider is confusing. There is a section for Recieves Test and Recieves winner. When the ruler is set to 20% recieves test and 80% recieves winner, does that mean that those that recieve the test will be divided into two sections of 10% each??