A Hotel Tracks the Number of Complaints Per Month

Multiple Choice

A hotel tracks the number of complaints per month. When the process is in control, there is an average of 35 complaints per month. Assume that a 2-sigma control limit is used. The next four months have 33, 27, 29, and 43 complaints. What should management do?

A) Look for assignable causes because the process is in control.
B) Look for assignable causes because the process is out of control.
C) Look for common causes because the process is out of control.
D) Do nothing; the process is in control.