New PMP Question & Answers with explanation

In order to keep costs low, a project management team decided to apply statistical sampling while inspecting some of the work products. They decided to select 10 out of 50 engineering drawings for inspection. During which process should the sample be collected?
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Quality metrics used during the Control Quality process are defined during which process?
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A project involved development of a high-speed, hard disk drive. As part of its testing, the hard disk was subjected to continuous operation at a high speed and an elevated temperature. At the end of the test, the hard disk was destroyed beyond use. The cost of such testing is usually classified as:
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Which of the following quality control tools and techniques may not be used for root cause analysis?
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A project was randomly selected for a quality audit, and the external auditor found various issues and nonconformance. The project manager lodged a complaint with the quality department that this was improper procedure, and he should have received notice since an external auditor was involved. What is your view?
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