Quality Control Plots

Types of control plots:

• X-bar (sample mean)
• R (range)
• S (standard deviation)
• p (fraction nonconforming)
• np (number nonconforming)
• c (count of conconformances)
• u (count of nonconformances per unit)

Displayable lines:

• Mean of all measurements
• Control limits
• Warning limits
• Specification value (X-bar only)
• upper and lower specification limits (X-bar only)

Sample Results as an Excel Chart: