Two employees, same average rating — but should we trust 10 scattered scores the same as 4 consistent ones? Inspired by Evan Miller’s work on ranking items with star ratings, this post walks through a Bayesian approach that accounts for both spread and sample size.

Stop guessing how many calls to audit. Use this statistical formula to calculate the exact sample size needed for call audits that prove quality improvements. Learn about confidence levels, power calculations, and A/B testing verification for your sales team.