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Per Kohavi 'Trustworthy Online Controlled Experiments', the MINIMUM DETECTABLE EFFECT (MDE) in an A/B test depends on which?
ASample size, variance, significance level
BNumber of designers on the team
CPhase of the moon on launch day
DNumber of GPU cores on the server
Answer & Solution
Correct answer: A. Sample size, variance, significance level
Kohavi: MDE ∝ √(σ²/n). Higher variance or lower n raises the MDE. Significance (α) + power (1-β) also feed the formula.
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