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Per Kohavi + Riot, the CUPED variance-reduction technique for A/B tests uses which?
AMore RAM allocated on the analytics server
BPre-experiment covariates to adjust variance
CFaster network links connecting to clients
DHigher frame rate during the experiment run
Answer & Solution
Correct answer: B. Pre-experiment covariates to adjust variance
Deng et al. 2013 (CUPED): regress outcome on pre-period covariate, reducing variance + shrinking MDE by 20-50% at no extra sample cost.
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