What defines a hypothesis in scientific research?

A hypothesis in scientific research is defined as a proposed explanation for a problem or set of observations. This means that it serves as a starting point for further investigation and experimentation. Researchers formulate a hypothesis based on existing knowledge and observations in order to explain a specific phenomenon or issue they have identified. It is a tentative statement that can be tested through experimentation and observation, allowing scientists to assess its validity.

In contrast, the other options represent concepts different from a hypothesis. A definitive statement implies a certainty that goes beyond the speculative nature of a hypothesis. A conclusion derived from experimental data refers to findings that come after conducting research, which is the result of testing a hypothesis rather than the hypothesis itself. An established theory is a well-substantiated explanation that has been repeatedly tested and confirmed through observation and experimentation, which also distinguishes it from the initial and more uncertain nature of a hypothesis.