What is the focus of persuasive speeches to impact the audience's beliefs? Provide an example

What will be an ideal response?

Speeches that impact audience beliefs are focused on changing what the audience sees as true or false. For example, a belief changing persuasive speech might seek to change the audience's beliefs about the mumps, measles, and rubella vaccine (MMR) by persuading them that there is no scientific evidence that the MMR vaccine is linked to autism.