1. Which of the following statements is INCORRECT regarding process variations?
ID: 343717 • Letter: 1
Question
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
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.
Explanation / Answer
1. The correct Answer is "A process under statistical control is a process with zero variation."
In any production process, regardless of how well designed or carefully maintained it is, a certain amount variability will always exist. The best we can do is to reduce it however we can not make it zero.
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