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.

Your new sales rep is converting at 10% instead of the expected 16%. Fire him? Not so fast. Using the binomial distribution function built into Excel and Google Sheets, you can calculate the exact probability that poor results are just a cold streak — and make staffing decisions you can actually defend with math.