Answer: True
Explanation: True.
Speakers who deliver informative speeches need to establish and maintain both initial credibility (based on their expertise, knowledge, and qualifications) and derived credibility (based on how effectively they deliver the information and engage the audience). Initial credibility helps the audience trust and respect the speaker from the start, while derived credibility is built throughout the speech through the speaker's delivery, organization, evidence, and overall effectiveness in conveying the information. Both forms of credibility are important for the audience to perceive the speaker as credible and trustworthy, which enhances the impact and effectiveness of the informative speech.