Question

the main value of using statistics in a speech is to
multiple choice
enhance the speakers credibility.
make the speech more vivid.
avoid relying on testimony.
quantify the speakers ideas.
lend realism to the speech.

Explanation:

Statistics in a speech provide numerical data. This numerical representation (quantification) helps in clearly presenting the speaker's ideas. For example, instead of saying "many people are affected", using "50% of the population is affected" (a quantified statement using statistics) makes the idea more precise. While enhancing credibility (through evidence - based stats) is a secondary aspect, the primary value is quantification. Making the speech vivid is more about descriptive language (not just stats), avoiding testimony is not the main goal (stats can co - exist with testimony), and lending realism is a more general effect which is overshadowed by the precise quantification aspect.

Answer:

quantify the speaker's ideas.