Which principle best captures the idea that conclusions must be supported by evidence?

• A. Conclusions should be supported by reliable data
• B. Conclusions should be popular
• C. Conclusions should be novel
• D. Conclusions should be concise

Answer: (A)

The main idea here is that a claim has real credibility only when it is backed by trustworthy evidence. When conclusions are tied to reliable data gathered through sound methods, others can evaluate the reasoning, reproduce results, and see exactly how the claim was justified. Reliable data means data that comes from appropriate sources, with careful collection and analysis, enough sample size, and steps taken to minimize bias and error. This kind of evidence provides a solid basis for generalizing a claim beyond a single observation.

Think of it in practical terms: if a conclusion about a treatment’s effect is supported by many well-designed studies that show consistent results, that support is strong. If instead the conclusion rests on a lone anecdote or a method with unclear procedures, the evidence is weak, and the conclusion shouldn’t be trusted as firmly.

Choices like being popular, being new, or being concise don’t guarantee truth or justification. Popularity reflects what people believe or like, not whether something is true. Novelty adds a sense of newness, but not evidentiary support. Conciseness is about brevity, not sufficiency of evidence. The standard we’re aiming for is clear: the conclusion must rest on solid, verifiable data.