Final answer:
While a rational style of communication may often be associated with a slower rate of speech and subdued volume to allow for thoughtful deliberation there is no definitive rule that this is always the case for every rational communicator.
Step-by-step explanation:
The question "A person with a preference for the rational style is more likely to use a slower rate of speech at a subdued volume" can be approached by considering the relationship between communication styles and the concept of rationality in the context of public speaking. In communication theory, someone who prefers a rational style, which involves logical thinking and critical analysis, might opt for a slower rate of speech and a more subdued volume to convey their messages thoughtfully and deliberately.
This behavior allows listeners to process complex or detailed information more effectively. However, without explicit evidence linking a rational style to specific speech patterns like rate and volume, one cannot definitively say this is always true for every individual with a rational preference. Hence, the statement as a universal truth may not be accurate.