
225Taguchi Design to Improve Customer Satisfaction of an Airline Company
factor with the assurance that the noise factors do not have a signicant
impact on the waiting time.
For the “1” level of the “Bags” factor, Figure13.14 shows a higher signal-to-
noise ratio and Figure13.15 shows a lower average waiting time. This means
that we can safely recommend the “1” level for the “Bags” factor with the
assurance that the noise factors do not have a signicant impact on the wait-
ing time.
For the “FB” level of the “Food/Bev” factor, Figure13.14 shows a higher
signal-to-noise ratio and Figure13.15 shows a lower average waiting time.
This means t