In scientific inquiry, which description best defines a hypothesis?

• A. A testable and falsifiable statement.
• B. An untestable belief.
• C. A currently accepted fact.
• D. A law of nature.

Answer: (A)

In scientific inquiry, a hypothesis is a testable and falsifiable statement that offers a tentative explanation and makes a specific prediction that can be tested through observation or experiment. This quality—being testable and capable of being shown false—allows researchers to evaluate whether the proposed explanation holds up under evidence. A hypothesis isn’t just a belief or a guess; it’s something that can be supported or refuted by data.

A belief that cannot be tested isn’t scientific, which is why it doesn’t fit. A currently accepted fact is a statement supported by evidence, but it’s not a tentative claim intended for testing in the same way a hypothesis is. A law of nature describes consistent relationships observed in nature under defined conditions, and while it explains what happens, it isn’t a provisional statement meant to be tested in the same experimental sense as a hypothesis.