Developer martin cray had low credibility when he began his speech to a neighborhood group opposed to a new shopping center he hoped to build. during the speech, his credibility increased because his audience was impressed with his command of the facts and his willingness to work with the neighborhood on plans for the shopping center. the credibility produced by everything martin did and said during the speech is credibility:

Derived credibility

Explanation:

Credibility is the quality that we may possess and can make us be trustworthy. If you can't be trusted people will find it hard to believe even the things you say. It mostly based on how the audience sees you and how they think of your competence and personality

Derived credibility is established as the speaker delivers the speech this is based on how professional the speaker is. Derived means it is drawn from the way you deliver your speech.

So your speech is what gives you this credibility. It can also be how you present yourself in your resume.