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Confidence Level Selection Basics

Choose a confidence level wisely

This guide explains selecting a confidence level: common choices like 90/95/99%, trade-offs between interval width and certainty, and aligning with decision risk and sample size.

Know common levels

90%, 95%, and 99% are typical; higher means wider intervals.

Match risk and cost

Use higher levels when wrong decisions are costly; lower when speed matters.

Check sample size

Higher confidence needs more data to avoid overly wide intervals.

Be consistent

Use the same level across related analyses for comparability.

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