Page 132 - Six Sigma Demystified

Chapter 5 m e a s u r e s tag e 113

C. 98 percent.
D. 95 percent.

7. Specification limits for a process
a. provide the best estimate of the process output— all output naturally will be
produced within the specification limits.
B. are often arbitrary goalposts that don’t adequately express the real voice of
the customer, who values consistency.
C. naturally optimize the process by providing realistic goals.
D. were devised by Taguchi to replace his loss function.

8. Process control charts
a. are interchangeable with enumerative statistical methods such as confidence
intervals.
B. provide the same results as confidence intervals but are preferred because of
the easy in interpreting the graph.
C. provide results similar to confidence intervals but are inferior owing to their
simple graphic approach.
D. provide different results than confidence intervals by indicating whether a
process is stable over a period of time.

9. Special causes of process variation
a. can be predicted through effective brainstorming sessions with the
responsible process personnel.
B. can be eliminated by frequent calibrations of the measuring device.
C. are not worth investigating because they happen infrequently.
D. can be identified only by a properly constructed control chart.

10. When defining the baseline for a Six Sigma project,
a. a control chart should be used to reduce bias effects from special causes.
B. the process histogram is the best tool for showing variation in the process.

C. the presence of sporadic process shifts has no impact owing to their
spontaneity.
D. a large sample will ensure that the confidence interval picks up the special
causes.