Listeners tend to distrust speakers who do not appear credible.

True.

Explanation:

Listeners tend to distrust speakers who do not seem credible. For this reason, any speech you give should be very well designed and studied so that you can speak with confidence and true information in order to give credibility to the audience listening to your speech. When the speech is credible, listeners will not distrust but trust their words.

experiments.

surveys.

questionnaires.

interviews.

case studies.

participant and non-participant observation.

observational trials.

studies using the delphi method.