1. Statistical control is achieved in this case:
a. Stable processes have only common cause variation
b. Stable processes have assignable causes of variation
c. Processes have inherent variation exceeding control limits.
d. Control charts are regularly produced for audit trail purposes.
2. Rational subgrouping refers to the following examples except:
a. The entire population under analysis
b. Consecutive produced parts from a process
c. Homogenous conditions
d. Minimization of assignable causes
3. Control charts should be set up for
a. Vital quality characteristics
b. All quality characteristics
c. All product characteristics
d. All inspection characteristics