During a speech, a speaker uses statistics and factual information to support their claims. This is known as:

The correct answer is empirical evidence. This type of evidence relies on data that can be observed and measured, including statistics and factual information, to substantiate claims made during a speech. Empirical evidence is important because it provides a strong foundation for arguments, helping the audience to understand and believe the speaker's assertions. In public speaking, using empirical evidence enhances the credibility of the speaker and strengthens their overall argument by grounding it in verifiable facts rather than personal opinions or narratives.

Other forms of evidence, such as testimonial evidence (which relies on the opinions or experiences of individuals), anecdotal evidence (which draws on personal stories or isolated examples), and expert evidence (which is derived from the opinions of recognized authorities in a specific field), do play important roles in persuasion but do not primarily focus on statistical data and factual information as empirical evidence does.