Project Management Professional (PMP) Exam Practice – Question1778

Statistical sampling is a method in perform quality control to determine the conformance to requirements for some component or product of a project. Its greatest advantage is that it______________


A. Does not require a large expenditure of resources
B. Is accurate enough with a sampling of less than 1%
C. Does not require 100% inspection of the components to achieve a satisfactory inference of the population
D. Needs to be conducted only when a problem is discovered with the end product or when the customer has some rejects

Correct Answer: C

Explanation:

Explanation:
The application of the statistical concept of probability has proven, over many years in many applications, that an entire population of products need not be inspected, if the sample selected conforms to a normal distribution of possible outcomes (the “bell” curve).
Sample frequency and sizes should be determined as the quality management plan is prepared in order that the cost of quality includes the number of tests and expected scrap.