It is not possible for the 
chart to be out-of-control when the R chart is in control.
Definitions:
Lumbar Curvature
Refers to the natural inward curve of the lower back, which is essential for distributing mechanical stress during movement.
Job Analysis
The process of studying and collecting information about a job's tasks and responsibilities, used to determine job requirements, employee selection, and performance standards.
Labor Needs
The demand for workforce or personnel required by organizations to carry out their operations effectively.
Job Performance
The effectiveness with which an employee carries out the duties, tasks, and responsibilities of their job role.
Q3: Refer to the figure above. If an
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