numeric

Effect of halving the MDE

Statistics & Inference · Intervals & Errors · easy · Original Uplift question · 5 min

You halve the minimum detectable effect you want to catch while holding power and alpha fixed. By what factor does the required sample size change? Answer as a multiplier.

Evaluation criteria

  • Uses the correct method or distribution
  • Shows the calculation
  • Rounds as the prompt asks

Detailed grading feedback appears after you submit.

    Source

    Original Uplift question based on a common interview pattern.

    Your answer

    x sample size

    Commas, currency symbols and a trailing percent sign are fine. Answers within ±0.01 x sample size of the expected value are accepted.

    You get one graded attempt here without an account. Create a free account for unlimited attempts, saved progress and community write-ups.

    Answers stay hidden until you ask. Reveal the full model write-up when you are ready to compare.

    Community

    How other people solved this

    There is rarely one right query or one right framing. Read how others approached it, and share your own once you have submitted an answer.

    Reading is open to everyone. Sign in to share your approach or mark a write-up as helpful.

    Loading write-ups…