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The test only counts if an even amount of impressions is given. The viewers aren't given a choice between ad A and B, they have a choice between A (or B) and no
by dkokelley 17y ago
The test only counts if an even amount of impressions is given. The viewers aren't given a choice between ad A and B, they have a choice between A (or B) and nothing. I don't think the author explained this well enough. Obviously (to everyone here) the test is inconclusive if one ad is shown much more than the other.