1- The mean of a process is 50, and the standard deviation is 2. The company uses statistical control process (SPC) to monitor the process. It uses sample size on 4, and 3 sigma (z=3) control limits. What are the Upper Control Limit (UCL) and Lower Control Limit (LCL)?

a- LCL= 48 and UCL=52

b- LCL = 47 and UCL=53

c- LCL = 49 and UCL=51

d- LCL = 44 and UCL=56

2- If a company narrows the control limits for a process without making any other changes, which of the following will happen?

a- the process will generate more products not acceptable by customers

b- the process will not be stopped even when assignable cause is present

c- the capability index for the process will reduce to a lower value

d- the process will be stopped more often suspecting assignable cause

3- Which of the following is a reason why queues will form even if capacity exceeds demand?

a- there is no variability in average capacity

b- customers do not arrive in a consistent pattern

c- customers arrive in a consistent pattern

d- there is no variability in the arrival of customers