LSSGB: Which of the following pairs is the most useful in preparing control charts, when used together, for variables data?

Options

• AQL, p-bar
• p, n
• X-bar and R
• R, sigma

Answer

X-bar and R

EXPLANATION

An X-bar and R chart is represented best by variables data. Options a and b list attribute data quantities. The two values in option d are measures of dispersion and are not used together in control charting.