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Randomization
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754.
Stratified Randomization
easy
Stratified randomization is used in an experiment. What does it ensure?
A
Key covariates are balanced across groups by randomizing within subgroups defined by those covariates
B
Users with extreme covariate values are excluded to prevent confounding at the tails of the distribution
C
The treatment effect is estimated separately within each stratum and then pooled across strata
D
Groups have equal sample sizes by stratifying users into equal-sized buckets before assignment
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