New PMP Question & Answers with explanation

During a project's execution phase, 100 products were developed based on the originally approved blueprint. The project team randomly selects 20 products to evaluate against the quality plan. What is the project team performing?
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While reviewing the quality of deliverables with the team, the project manager determines that several quality issues could have been avoided by using a simple checklist. The checklist is then implemented for future deliverables. What did the project manager do in this situation?
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A project manager needs to evaluate the effectiveness of corrective actions taken to address the project's approved change requests. What should the project manager use?
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A food company receives customer complaints that a product is underweight. What tool or technique can the project manager use to determine if something needs to be changed in the production line?
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