Answers for the QC Calculations Problem Set.
Basic QC Practices
A problem set of sample data for users to calculate mean, SD, etc.
Answers to the Levey-Jennings Control Chart lesson exercise.
Those "Westgard rules" can be confusing. How do you use them? This lesson combines basic QC theory and practice to show you how. Dr. Westgard walks you through a Levey-Jennings chart day by day, plotting the control data and pointing out which run violates which rule. See how the multirule QC should be done (and find out if you've been doing it right yourself).
This lesson discusses one of the cornerstones of QC practice. We can no longer take for granted that everyone knows how to build a control chart, plot the control values, and interpret those results correctly. Patricia L. Barry, co-author of Cost-Effective Quality Control: Managing the Quality and Productivity of Analytical Processes, provides a primer on how to construct, use, and interpret the Levey-Jennings chart.