This document discusses different types of hypotheses used in educational research. It defines a hypothesis as a tentative explanation or prediction about the relationship between variables that can be tested. The main types discussed are research hypotheses, null hypotheses, and conceptual models/theoretical frameworks. Research hypotheses propose a relationship between variables, while null hypotheses propose no relationship. Conceptual models and theoretical frameworks provide maps and structures to help understand phenomena being studied. Examples are provided of how a research problem can relate to a research hypothesis and corresponding null hypothesis. Assumptions and how they differ from hypotheses are also explained.