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Channel: Hypothesis testing: Difference of means (pre-treatment) - Cross Validated
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Answer by Demetri Pananos for Hypothesis testing: Difference of means...

Your conclusion is/was correct. Randomization is not about balancing groups. Indeed, there is a good chance that unobserved confounders are unbalanced and yet randomization still works. In fact, the...

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Hypothesis testing: Difference of means (pre-treatment)

I had a formative experience a couple years ago. The context was a live user experiment where the baseline proportion was approximately 98%. While the strategy had limited room to scale, management was...

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