what is the difference between a control group and a test group? how to rerandomize testing data why rerandomize test groups can you randomly divide cities into test and control groups why randomize cities in a test why do we randomly split test groups what is flipped test if a test is run randomly how many city's will the population be in this test can you flip the test and control groups how to randomly divide test group why do you randomly split test groups how to flip a test group what is the best method to randomly split a website into test groups and control groups? which method would you use for a static a/b test why is it necessary to switch the test from control group to control when do you flip test groups how to randomize testing methodology why is it so difficult to randomly divide cities into test groups why do you flip a test group can you split testing into control group