In order for a PM to be "believeable" the PM must have technical and administrative credibility.

Question

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A PM who possesses both technical and administrative knowledge and skills is more likely to earn the trust and respect of their team members, stakeholders, and clients. Technical credibility entails familiarity with the tools, processes, and methodologies used in the project's industry or domain. Administrative credibility involves having the ability to lead, organize, and manage project resources, including people, time, and budget. A PM who has both kinds of credibility can communicate effectively with team members, make sound decisions, and respond to project issues and risks in a competent and confident manner.

In Order for a PM to Be "Believeable" the PM