d) All of the above are correct
e) None of the above are correct
15- The UCL and LCL for an X bar chart are 25 and 15
respectively. The central line is 20, and the process variability
is considered to be in statistical control. The results of the next
six sample means are 18, 23, 17, 21, 24, and 16. What should
you do?
a) Explore the assignable causes because the second,
fourth, and fifth samples are above the mean.
b) Finding and correcting causes of poor quality.
c) Explore the assignable causes because there is a
trend.
d) Explore the assignable causes because there is a
run.
e) Nothing; the process is in control.
16- If there is certain assignable cause detected in the process
what should be first?
a) Solve the problem
b) Find the root cause of the problem
c) Stop the process
d) Kaizen
e) Delete the observations violating the limits
17- Written description of a process is called?
a) Instructions
b) Procedure
c) Formal description
d) ISO 9001
e) Statement of process
