New PMP Question & Answers with explanation

The project management team performed activities such as measuring, examining, and verifying to determine whether work and deliverables met requirements and product acceptance criteria. Which of the following choices refers to a different set of activities than the ones just mentioned?
Select one
Which process group corresponds to the "Act" component of the Plan-Do-Check-Act cycle?
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You are a project manager for Enormous Co. and are currently engaged in a highly visible project. The company is about to implement an independent review to ensure that the project work is continuing to comply with the project‘s policies, processes, and procedures. During which process would this review occur?
Select one
Statistical sampling involves choosing part of a population for inspection. Appropriate sampling can often ___________the cost of quality control.
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You are a project manager who is in charge of an important project for your company. The project includes producing widgets for your customer. The collected data helps identify the greatest causes of defects in the overall process. Which technique should you use to determine the correlation between two variables being analyzed?
Select one