Question

Which option correctly defines process capability?

a) The range of natural variability in a process
b) A sequence of sample values that display the same tendency in a control chart
c) The upper or lower band of a control chart
d) A product's inherent ability to meet specifications consistently

Answer 1

Process capability is a product's ability to consistently meet specifications. It is statistically measured and considers the inherent process performance against the set specification limits. Understanding natural, induced, and sample variability is crucial in assessing process capability.

Step-by-step explanation:

The correct definition of process capability is option d) A product's inherent ability to meet specifications consistently. Process capability refers to the statistical measure of a process's ability to produce items within the specified tolerance range set for the product or service. It is about the performance of a process and its limits, assessing the ability to produce outputs that are within specification limits.

To understand process capability, it is also essential to understand different types of variability such as:

• Natural variability, which is the inherent differences that naturally occur in a process or a population.
• Induced variability, which arises from deliberate changes made in the process.
• Sample variability, that occurs when different samples from a population show different outcomes, even under the same conditions.