What type of research would be least likely to include a research hypothesis?

Descriptive research is least likely to include a research hypothesis, as it only portrays conditions.

Intervention research tests the effect of a treatment and needs a hypothesis.

Associational research examines relationships between variables, guided by a hypothesis.

Experimental research is built around testing a hypothesis about cause and effect.

Descriptive work answers what, how many or how often rather than predicting relationships.

It may pose research questions yet often proceeds without a formal hypothesis.