Fill in the blank: When performing email A/B tests, _______.
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Correct answer: testing one variable at a time is recommended, because it allows you to isolate the effect of each variable.
Why this is the answer
A/B testing is most useful when the change being tested is isolated. Testing one variable at a time makes it clearer whether the performance difference came from the subject line, content, sender name, or another specific element. HubSpot A/B test reporting compares version performance against selected email metrics. Changing multiple variables at once can make results harder to interpret.