Is there any relationship between specification limits and control limits of x̄ and R charts?
a. Yes, Specification limits = Control limits
b. Yes, Control limits = Specification limits/2
c. No
d. Yes, Control limits * 0.5 = Specification limits
2. Control limits are ___
a. Limits defined by customers
b. Limits driven by the natural variability of the process
c. Limits driven by the inherent variability of the process
d. Statistical limits
3. The natural variability of the process is measured by ____
a. Process mean
b. Sample standard deviation
c. Process standard deviation
d. Sample mean
4. Process standard deviation is necessarily equal to the sample standard deviation of the same process.
a. True
b. False
5. Once a set of reliable control limits is obtained, we use the control chart for monitoring future production. This is called _____
a. Phase I control chart usage
b. Phase II control chart usage
c. Phase III control chart usage
d. Phase IV control chart usage
6. When the upper and lower natural tolerance limits are equal to the upper and lower specification limits, the process capability ratio, cp is ___
a. Greater than 1
b. 0
c. Less than 1
d. Equal to 1
7. x̄ chart monitors _____
a. Between-sample variability
b. Within-sample variability
c. Neither between-sample nor within-sample variability
d. Both between-sample variability and within-sample variability