What are seven consecutive data points on either side of the mean called?

A major phase in a project has ended and the project manager wants to conduct a lessons learned session.
The phase was difficult and many objectives were not achieved. The participants were hesitant to provide feedback.
In order to solve this situation, what should the project manager do?

Which of the following is not a process of Project Communcations Management?

During risk management planning meetings, the project manager realizes that there is a very broad spectrum of risks being identified. This has made it difficult to properly maintain the risk register.
What should the project manager do?

All of the following statements are true regarding a change control system EXCEPT: