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Well I guess you could be running a MANOVA or something to test over joint outcomes, but the AB test is over some sort of metric. I mean, when you set up an experiment, you need to have defined the dependent variable first. Now, after you have randomly split your treatment groups you can do post hock analysis, which I think is what you are referring to. But if you are optimizing, here needs to be some metric to optimize over. Of course at the end of the day the hypothesis test just tells you prob(data or greater| null=true) which I am not sure provides a direct path to decision making.

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