The natural tolerance limits for a normally distributed process that is in statistical control:
A)Extend beyond the specification limits when a process is capable.
B)Are within the specification limits when a process is capable.
C)Contain approximately 99.73 percent of the individual process measurements.
D)Both Are within the specification limits when a process is capable and Contain approximately 99.73 percent of the individual process measurements are correct.
E)Both Extend beyond the specification limits when a process is capable and Contain approximately 99.73 percent of the individual process measurements are correct.

Question

Quizplus · Accepted Answer

Natural tolerance limits represent the range of values within which almost all the process measurements will fall, assuming a normal distribution. For a normally distributed process that is in statistical control, the natural tolerance limits will contain approximately 99.73% of the individual process measurements. However, the natural tolerance limits are not the same as the specification limits, which represent the acceptable range of values for a product or service. When a process is capable, meaning that its variability is small compared to the specification limits, the natural tolerance limits will be within the specification limits. Therefore, both options A and B are incorrect. Option D correctly states that the natural tolerance limits will be within the specification limits when a process is capable and will contain approximately 99.73% of the individual process measurements. Option E is incorrect because the natural tolerance limits will not extend beyond the specification limits when a process is capable.

The Natural Tolerance Limits for a Normally Distributed Process That