1. Which of the following statements is INCORRECT regarding process variations?
Assignable variations can be reduced and eliminated.
Common variation is inevitable.
A process under statistical control is a process with zero variation.
It is impossible to have zero variation in production processes.
2. An activity in a PERT network has these time estimates: optimistic = 2, most likely = 5, and pessimistic = 8. The variance of the activity time is:
1.00
0.50
0.25
1.21
3. Suppose you are asked to determine the Lower Control Limit for a p-chart for quality control purposes. Samples are taken from the production line. The fraction defective is 0.03 and the standard deviation is 0.006 based on the samples. Set z = 3. Which of the following is the LCL of the p-chart?
0.012
0.048
0.006
0.013