Recognize the different kinds of unknown
Sometimes you know the subject but cannot recall a figure. Sometimes you understand one part of the issue but have never worked in the setting the host describes. Sometimes the question is entirely outside your expertise. These situations call for different answers, and none requires pretending to know more than you do.
Name the specific limit. “I do not have that number in front of me” differs from “I have not worked with that type of organization.” A precise boundary keeps the audience from mistaking a memory gap for a lack of knowledge, or a narrow experience for broad authority.
Give the useful part without guessing
If you can explain the decision process without a missing statistic, do that. You might say, “I would want to see the cost of delivery and the expected workload before recommending a price.” That gives listeners a way to think without inventing the answer to a question you cannot settle.
Distinguish clearly between an observation, an interpretation, and a hypothesis. Avoid attaching “probably” to an unsupported number and treating it as good enough. A confident delivery does not turn speculation into evidence, especially when listeners may repeat the claim without your original qualification.
Offer a follow-up you can actually complete
If a verified source would resolve the question, offer to send it after recording. Make a brief note and confirm what the host needs: a link, a correction, or a short explanation. Do not promise a detailed research memo casually if you have no realistic plan to deliver one.
For topics with legal, medical, financial, or other specialized implications, avoid giving personalized advice outside your role. You can explain your own process or describe the kind of qualified professional who could assess the issue. Keep the boundary relevant to the question rather than adding a generic disclaimer to every answer.
Practice the sentence before you need it
Use these as practice openings: “I would need to verify that figure.” “My experience covers smaller teams, so I would be cautious about extending it.” “I do not know enough about that situation to recommend a decision.” Follow with a useful, supportable point only if you have one.
Ask a colleague to include one unfamiliar question in your rehearsal. Your goal is to respond naturally without apologizing repeatedly or filling the silence with guesses. After the real interview, complete any promised follow-up promptly and make clear whether it corrects something you said or simply adds context.