system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
L-J chart is used for monitoring -a)  Accuracyb)  Precisionc)  Sensitivityd)  Specificity
assistant
The correct answer is  The formulation of Westgard rules were based on statistical methods. 
Westgard rules are commonly used to analyse data in Shewhart control Charts Westgard rules are used to define specific performance limits for a particular assay and can beused to detect both random and systematic errors.