---
title: "QA/QC Standard Statistics"
canonical: "https://servicedesk.maxgeo.com/space/MAXGEO/1066270765/QA%2FQC%20Standard%20Statistics"
format: markdown
---
- Difference % = 100 * (Result – Expected Value) / Expected Value
- Total = Plotted points (not outliers)

- # Bad = Points outside outermost lines (not outliers)

- %Bad = 100 * #Bad / Total

- SD = calculated standard deviation STDEV

- CV (coefficient of variation) = SD / Mean –         This is actually called the

*relative standard deviation. CV is normally expressed as a percentage* •        95% Confidence Interval = 1.96 * (SD / √ Total) •        Bias of Mean (Mean Bias) =   
            100 * (Calc Mean – Expected Value) / Expected Value