Explanation/Reference:
Explanation:
One of the principles of agility includes working closely with business people. In order to manage stakeholder expectation, there must be open communication (through collaboration and transparency) throughout the project cycle. This maximizes alignment, helps with making business decisions, and reduces risk.
Although, the Scrum Guide does not directly state that the Scrum Master is responsible for ensuring transparency it is implicit. The Scrum Master is responsible for the process in which Scrum is adopted and enacted. Scrum is founded on empiricism and the Scrum Master helps those inside and outside the team work in an empirical environment which includes transparency (one of the three pillars of empiricism).

The trendline is based on the team's average velocity and the projective completion to zero is based on the team's velocity. The burndown chart is a helpful tool for Development Teams to self-manage BUT it is not mandatory as the teams will decide the best way to manage their own progress and promote transparency.

Scrum is a framework within which people can address complex adaptive problems, while productively and creatively developing, delivering, and sustaining complex products of the highest possible value. Scrum employs an iterative, incremental approach to optimize predictability and control risk.

Many people misinterpret the Scrum Guide as stating the Development Team size is limited to 3-9 members.
In reality, it only states that there is inherent risk attached to having less than 3 members and more than 9 members. As the number of members increases, the lines of communication also increase. This can be calculated using the Group intercommunication formula: n(n − 1) / 2 where n is the number of members.
Some teams are able to handle the risk and "synergize" whereas others might struggle. Saying that, the relationship between defining a Sprint Goal and Development Team size is unclear.
But the relationship between the ordering of the Product Backlog, the PO having clear objectives, and the Sprint Goal are direct. The Product Owner typically comes to the Sprint Planning with a business objective in mind and Product Backlog items related to the business objective. After deciding what can be done for the upcoming Sprint, the Scrum Team will craft a Sprint Goal that would be met through the implementation of the items. This is not dependent on the size of the team nor length of the Sprint.
Scrum is also a framework that's fit for purpose. Some projects/products are not fit for Scrum... or, better stated, Scrum is not suitable for all projects/products.

The Scrum Team members have courage to do the right thing and work on challenging problems. The Scrum Team agree to be open (to speak and listen) about all the work and the challenges with performing the work.
Scrum Team members respect each other's skills, experience, and opinions.