New PMP Question & Answers with explanation

You are using a process to measure the quality results over time. You are reviewing this graphic at your status meeting and explain that this information is based on sample variance measurements. Your measurements are within two standard deviations. Which of the following options are true?
Select two
All of the following are activities of the configuration management system except for which one?
Select one
You are a project manager for Star Light Strings. Star Light manufactures strings of lights for outdoor display. Its products range from simple light strings to elaborate lights with animal designs, bug designs, memorabilia, and so on. Your newest project requires a change. One of the business unit managers submitted a change through the change control system, which utilizes a CCB. Which of the following is true regarding the CCB?
Select one
You are a project manager for Star Light Strings. Star Light manufactures strings of lights for outdoor display. Its products range from simple light strings to elaborate lights with animal designs, bug designs, memorabilia, and so on. Your newest project requires a change. You are performing the Control Quality process and are looking at and testing a sampling of the product for conformance to quality standards. The tolerable result for the bulbs used on the string is 995–1,000 hours. All of the light bulbs must be LED bulbs. Which of the following are true regarding this process?
Select one
You are a project manager for Bluebird Technologies. Bluebird writes custom billing applications for several industries. One of your users asks for some changes to the invoice functionality during a status meeting. You explain to her that the change needs to go through the change control system, which is a subset of the configuration management system. You explain that a change control system does which of the following?
Select one